From 4f13cb742476d81a6b42a2aa5996e82a478c2481 Mon Sep 17 00:00:00 2001
From: Judd <4046440+foldl@users.noreply.github.com>
Date: Sun, 17 May 2026 08:13:44 +0800
Subject: [PATCH] webui: support video files as input (#22830)

---
 tools/ui/src/app.d.ts                         |  2 ++
 .../app/badges/BadgesModality.svelte          | 10 ++++---
 ...hatAttachmentsListItemThumbnailFile.svelte | 14 ++++++++--
 .../ChatAttachmentsPreview.svelte             | 24 ++++++++++++++++-
 .../ChatAttachmentsPreviewCurrentItem.svelte  | 15 ++++++++---
 ...tAttachmentsPreviewCurrentItemVideo.svelte | 26 +++++++++++++++++++
 ...hatAttachmentsPreviewThumbnailStrip.svelte |  5 +++-
 .../ChatFormActionAddDropdown.svelte          |  3 +++
 .../ChatFormActionAddSheet.svelte             |  3 +++
 .../ChatFormActionsAdd.svelte                 |  4 +++
 .../ChatFormActionModels.svelte               |  6 +++++
 .../ChatFormActions/ChatFormActions.svelte    |  3 +++
 .../app/chat/ChatScreen/ChatScreen.svelte     | 17 +++++++++++-
 tools/ui/src/lib/constants/attachment-menu.ts |  9 +++++++
 tools/ui/src/lib/constants/icons.ts           | 10 ++++---
 .../src/lib/constants/supported-file-types.ts | 13 ++++++++++
 tools/ui/src/lib/enums/attachment.ts          |  5 +++-
 tools/ui/src/lib/enums/chat.ts                |  3 ++-
 tools/ui/src/lib/enums/files.ts               | 16 ++++++++++++
 tools/ui/src/lib/enums/index.ts               |  1 +
 tools/ui/src/lib/enums/model.ts               |  3 ++-
 .../lib/hooks/use-attachment-menu.svelte.ts   |  1 +
 tools/ui/src/lib/services/chat.service.ts     | 19 ++++++++++++++
 tools/ui/src/lib/stores/models.svelte.ts      | 20 +++++++++++---
 tools/ui/src/lib/types/api.d.ts               |  5 ++++
 tools/ui/src/lib/types/common.d.ts            |  7 ++++-
 tools/ui/src/lib/types/database.d.ts          |  9 +++++++
 tools/ui/src/lib/types/index.ts               |  1 +
 tools/ui/src/lib/types/models.d.ts            |  2 ++
 tools/ui/src/lib/utils/attachment-type.ts     | 21 +++++++++++++++
 .../src/lib/utils/convert-files-to-extra.ts   | 15 +++++++++++
 tools/ui/src/lib/utils/file-type.ts           | 13 ++++++++++
 tools/ui/src/lib/utils/index.ts               |  2 +-
 .../src/lib/utils/modality-file-validation.ts | 16 ++++++++++--
 .../src/lib/utils/process-uploaded-files.ts   |  4 +++
 .../tests/stories/fixtures/storybook-mocks.ts | 11 +++++---
 36 files changed, 310 insertions(+), 28 deletions(-)
 create mode 100644 tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewCurrentItem/ChatAttachmentsPreviewCurrentItemVideo.svelte

diff --git a/tools/ui/src/app.d.ts b/tools/ui/src/app.d.ts
index f5af7323c..ec65952e9 100644
--- a/tools/ui/src/app.d.ts
+++ b/tools/ui/src/app.d.ts
@@ -39,6 +39,7 @@ import type {
 	DatabaseMessage,
 	DatabaseMessageExtra,
 	DatabaseMessageExtraAudioFile,
+	DatabaseMessageExtraVideoFile,
 	DatabaseMessageExtraImageFile,
 	DatabaseMessageExtraTextFile,
 	DatabaseMessageExtraPdfFile,
@@ -102,6 +103,7 @@ declare global {
 		DatabaseMessage,
 		DatabaseMessageExtra,
 		DatabaseMessageExtraAudioFile,
+		DatabaseMessageExtraVideoFile,
 		DatabaseMessageExtraImageFile,
 		DatabaseMessageExtraTextFile,
 		DatabaseMessageExtraPdfFile,
diff --git a/tools/ui/src/lib/components/app/badges/BadgesModality.svelte b/tools/ui/src/lib/components/app/badges/BadgesModality.svelte
index 841f1dd9f..d87184ea9 100644
--- a/tools/ui/src/lib/components/app/badges/BadgesModality.svelte
+++ b/tools/ui/src/lib/components/app/badges/BadgesModality.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { Eye, Mic } from '@lucide/svelte';
+	import { Eye, Mic, Video } from '@lucide/svelte';
 	import { ModelModality } from '$lib/enums';
 
 	interface Props {
@@ -11,7 +11,7 @@
 </script>
 
 {#each modalities as modality (modality)}
-	{#if modality === ModelModality.VISION || modality === ModelModality.AUDIO}
+	{#if modality === ModelModality.VISION || modality === ModelModality.AUDIO || modality === ModelModality.VIDEO}
 		<span
 			class={[
 				'inline-flex items-center gap-1 rounded-md bg-muted px-2 py-1 text-xs font-medium',
@@ -21,7 +21,11 @@
 			{#if modality === ModelModality.VISION}
 				<Eye class="h-3 w-3" />
 
-				Vision
+				Vision (Image)
+			{:else if modality === ModelModality.VIDEO}
+				<Video class="h-3 w-3" />
+
+				Vision (Video)
 			{:else}
 				<Mic class="h-3 w-3" />
 
diff --git a/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsList/ChatAttachmentsListItem/ChatAttachmentsListItemThumbnailFile.svelte b/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsList/ChatAttachmentsListItem/ChatAttachmentsListItemThumbnailFile.svelte
index 3eeace42f..df49dd467 100644
--- a/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsList/ChatAttachmentsListItem/ChatAttachmentsListItemThumbnailFile.svelte
+++ b/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsList/ChatAttachmentsListItem/ChatAttachmentsListItemThumbnailFile.svelte
@@ -1,10 +1,12 @@
 <script lang="ts">
-	import { X } from '@lucide/svelte';
+	import { X, Music, Video } from '@lucide/svelte';
 	import {
 		formatFileSize,
 		getFileTypeLabel,
 		getPreviewText,
 		isPdfFile,
+		isAudioFile,
+		isVideoFile,
 		isTextFile
 	} from '$lib/utils';
 	import { ActionIcon } from '$lib/components/app';
@@ -38,6 +40,8 @@
 	}: Props = $props();
 
 	let isPdf = $derived(isPdfFile(attachment, uploadedFile));
+	let isAudio = $derived(isAudioFile(attachment, uploadedFile));
+	let isVideo = $derived(isVideoFile(attachment, uploadedFile));
 	let isPdfWithContent = $derived(isPdf && !!textContent);
 
 	let isText = $derived(isTextFile(attachment, uploadedFile));
@@ -102,7 +106,13 @@
 	<div
 		class="flex h-8 w-8 items-center justify-center rounded bg-primary/10 text-xs font-medium text-primary"
 	>
-		{fileTypeLabel}
+		{#if isAudio}
+			<Music class="h-4 w-4 text-white/70" />
+		{:else if isVideo}
+			<Video class="h-4 w-4 text-white/70" />
+		{:else}
+			{fileTypeLabel}
+		{/if}
 	</div>
 {/snippet}
 
diff --git a/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview.svelte b/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview.svelte
index ca81e5443..cba323f2c 100644
--- a/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview.svelte
+++ b/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview.svelte
@@ -12,6 +12,7 @@
 		getAttachmentDisplayItems,
 		getLanguageFromFilename,
 		isAudioFile,
+		isVideoFile,
 		isImageFile,
 		isMcpPrompt,
 		isMcpResource,
@@ -29,6 +30,7 @@
 		textContent?: string;
 		isImage: boolean;
 		isAudio: boolean;
+		isVideo: boolean;
 	}
 
 	interface Props {
@@ -54,7 +56,8 @@
 				(item): PreviewItem => ({
 					...item,
 					isImage: isImageFile(item.attachment, item.uploadedFile),
-					isAudio: isAudioFile(item.attachment, item.uploadedFile)
+					isAudio: isAudioFile(item.attachment, item.uploadedFile),
+					isVideo: isVideoFile(item.attachment, item.uploadedFile)
 				})
 			)
 	);
@@ -102,6 +105,9 @@
 	let isAudio = $derived(
 		currentItem ? isAudioFile(currentItem.attachment, currentItem.uploadedFile) : false
 	);
+	let isVideo = $derived(
+		currentItem ? isVideoFile(currentItem.attachment, currentItem.uploadedFile) : false
+	);
 	let isImage = $derived(
 		currentItem ? isImageFile(currentItem.attachment, currentItem.uploadedFile) : false
 	);
@@ -148,6 +154,20 @@
 			: null
 	);
 
+	let videoSrc = $derived(
+		isVideo && currentItem
+			? (currentItem.uploadedFile?.preview ??
+					(currentItem.attachment &&
+					'mimeType' in currentItem.attachment &&
+					'base64Data' in currentItem.attachment
+						? createBase64DataUrl(
+								currentItem.attachment.mimeType,
+								currentItem.attachment.base64Data
+							)
+						: null))
+			: null
+	);
+
 	export function prev() {
 		currentIndex = currentIndex > 0 ? currentIndex - 1 : allItems.length - 1;
 	}
@@ -173,11 +193,13 @@
 					{currentItem}
 					{isImage}
 					{isAudio}
+					{isVideo}
 					{isPdf}
 					{isText}
 					{displayPreview}
 					{displayTextContent}
 					{audioSrc}
+					{videoSrc}
 					{language}
 					{hasVisionModality}
 					{activeModelId}
diff --git a/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewCurrentItem/ChatAttachmentsPreviewCurrentItem.svelte b/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewCurrentItem/ChatAttachmentsPreviewCurrentItem.svelte
index 3451c89d3..30e84812a 100644
--- a/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewCurrentItem/ChatAttachmentsPreviewCurrentItem.svelte
+++ b/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewCurrentItem/ChatAttachmentsPreviewCurrentItem.svelte
@@ -1,9 +1,10 @@
 <script lang="ts">
 	import type { ChatAttachmentDisplayItem } from '$lib/types';
-	import { Image, Music, FileText, FileIcon } from '@lucide/svelte';
+	import { Image, Music, Video, FileText, FileIcon } from '@lucide/svelte';
 	import ChatAttachmentsPreviewCurrentItemPdf from './ChatAttachmentsPreviewCurrentItemPdf.svelte';
 	import ChatAttachmentsPreviewCurrentItemImage from './ChatAttachmentsPreviewCurrentItemImage.svelte';
 	import ChatAttachmentsPreviewCurrentItemAudio from './ChatAttachmentsPreviewCurrentItemAudio.svelte';
+	import ChatAttachmentsPreviewCurrentItemVideo from './ChatAttachmentsPreviewCurrentItemVideo.svelte';
 	import ChatAttachmentsPreviewCurrentItemText from './ChatAttachmentsPreviewCurrentItemText.svelte';
 	import ChatAttachmentsPreviewCurrentItemUnavailable from './ChatAttachmentsPreviewCurrentItemUnavailable.svelte';
 
@@ -11,11 +12,13 @@
 		currentItem: ChatAttachmentDisplayItem | null;
 		isImage: boolean;
 		isAudio: boolean;
+		isVideo: boolean;
 		isPdf: boolean;
 		isText: boolean;
 		displayPreview: string | undefined;
 		displayTextContent: string | undefined;
 		audioSrc: string | null;
+		videoSrc: string | null;
 		language: string;
 		hasVisionModality: boolean;
 		activeModelId?: string;
@@ -25,21 +28,25 @@
 		currentItem,
 		isImage,
 		isAudio,
+		isVideo,
 		isPdf,
 		isText,
 		displayPreview,
 		displayTextContent,
 		audioSrc,
+		videoSrc,
 		language,
 		hasVisionModality,
 		activeModelId
 	}: Props = $props();
 
 	let IconComponent = $derived(
-		isImage ? Image : isText || isPdf ? FileText : isAudio ? Music : FileIcon
+		isImage ? Image : isText || isPdf ? FileText : isAudio ? Music : isVideo ? Video : FileIcon
 	);
 
-	let isUnavailable = $derived(!isPdf && !isImage && !(isText && displayTextContent) && !isAudio);
+	let isUnavailable = $derived(
+		!isPdf && !isImage && !(isText && displayTextContent) && !isAudio && !isVideo
+	);
 </script>
 
 {#if currentItem}
@@ -58,6 +65,8 @@
 			<ChatAttachmentsPreviewCurrentItemText {displayTextContent} {language} />
 		{:else if isAudio}
 			<ChatAttachmentsPreviewCurrentItemAudio {currentItem} {audioSrc} />
+		{:else if isVideo}
+			<ChatAttachmentsPreviewCurrentItemVideo {currentItem} {videoSrc} />
 		{:else if isUnavailable}
 			<ChatAttachmentsPreviewCurrentItemUnavailable {IconComponent} />
 		{/if}
diff --git a/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewCurrentItem/ChatAttachmentsPreviewCurrentItemVideo.svelte b/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewCurrentItem/ChatAttachmentsPreviewCurrentItemVideo.svelte
new file mode 100644
index 000000000..4ebbd5922
--- /dev/null
+++ b/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewCurrentItem/ChatAttachmentsPreviewCurrentItemVideo.svelte
@@ -0,0 +1,26 @@
+<script lang="ts">
+	import { Video } from '@lucide/svelte';
+
+	interface Props {
+		currentItem: { name?: string } | null;
+		videoSrc: string | null;
+	}
+
+	let { currentItem, videoSrc }: Props = $props();
+</script>
+
+<div class="flex flex-1 items-center justify-center p-8">
+	<div class="w-full max-w-md text-center">
+		<Video class="mx-auto mb-4 h-16 w-16 text-white/50" />
+
+		{#if videoSrc}
+			<video controls class="mb-4 w-full" src={videoSrc}>
+				Your browser does not support the video element.
+			</video>
+		{:else}
+			<p class="mb-4 text-white/70">Video preview not available</p>
+		{/if}
+
+		<p class="text-sm text-white/50">{currentItem?.name || 'Video'}</p>
+	</div>
+</div>
diff --git a/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewThumbnailStrip.svelte b/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewThumbnailStrip.svelte
index 4c3bd7807..3f19ee39c 100644
--- a/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewThumbnailStrip.svelte
+++ b/tools/ui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentsPreview/ChatAttachmentsPreviewThumbnailStrip.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { Music, FileText } from '@lucide/svelte';
+	import { Music, Video, FileText } from '@lucide/svelte';
 	import { HorizontalScrollCarousel } from '$lib/components/app/misc';
 
 	interface PreviewItem {
@@ -7,6 +7,7 @@
 		name: string;
 		isImage: boolean;
 		isAudio: boolean;
+		isVideo: boolean;
 		preview?: string;
 	}
 
@@ -49,6 +50,8 @@
 						>
 							{#if item.isAudio}
 								<Music class="h-4 w-4 text-white/70" />
+							{:else if item.isVideo}
+								<Video class="h-4 w-4 text-white/70" />
 							{:else}
 								<FileText class="h-4 w-4 text-white/70" />
 							{/if}
diff --git a/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddDropdown.svelte b/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddDropdown.svelte
index a6bb0fc2a..0a8260a29 100644
--- a/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddDropdown.svelte
+++ b/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddDropdown.svelte
@@ -23,6 +23,7 @@
 		class?: string;
 		disabled?: boolean;
 		hasAudioModality?: boolean;
+		hasVideoModality?: boolean;
 		hasVisionModality?: boolean;
 		hasMcpPromptsSupport?: boolean;
 		hasMcpResourcesSupport?: boolean;
@@ -37,6 +38,7 @@
 		class: className = '',
 		disabled = false,
 		hasAudioModality = false,
+		hasVideoModality = false,
 		hasVisionModality = false,
 		hasMcpPromptsSupport = false,
 		hasMcpResourcesSupport = false,
@@ -58,6 +60,7 @@
 		() => ({
 			hasVisionModality,
 			hasAudioModality,
+			hasVideoModality,
 			hasMcpPromptsSupport,
 			hasMcpResourcesSupport
 		}),
diff --git a/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddSheet.svelte b/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddSheet.svelte
index 4713ec477..5ca597366 100644
--- a/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddSheet.svelte
+++ b/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddSheet.svelte
@@ -19,6 +19,7 @@
 		class?: string;
 		disabled?: boolean;
 		hasAudioModality?: boolean;
+		hasVideoModality?: boolean;
 		hasVisionModality?: boolean;
 		hasMcpPromptsSupport?: boolean;
 		hasMcpResourcesSupport?: boolean;
@@ -34,6 +35,7 @@
 		disabled = false,
 		hasAudioModality = false,
 		hasVisionModality = false,
+		hasVideoModality = false,
 		hasMcpPromptsSupport = false,
 		hasMcpResourcesSupport = false,
 		onFileUpload,
@@ -49,6 +51,7 @@
 		() => ({
 			hasVisionModality,
 			hasAudioModality,
+			hasVideoModality,
 			hasMcpPromptsSupport,
 			hasMcpResourcesSupport
 		}),
diff --git a/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionsAdd.svelte b/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionsAdd.svelte
index 5d3a20b16..54ddcf9b0 100644
--- a/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionsAdd.svelte
+++ b/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionsAdd.svelte
@@ -7,6 +7,7 @@
 	interface Props {
 		disabled?: boolean;
 		hasAudioModality?: boolean;
+		hasVideoModality?: boolean;
 		hasMcpPromptsSupport?: boolean;
 		hasMcpResourcesSupport?: boolean;
 		hasVisionModality?: boolean;
@@ -20,6 +21,7 @@
 	let {
 		disabled = false,
 		hasAudioModality = false,
+		hasVideoModality = false,
 		hasMcpPromptsSupport = false,
 		hasMcpResourcesSupport = false,
 		hasVisionModality = false,
@@ -37,6 +39,7 @@
 	<ChatFormActionAddSheet
 		{disabled}
 		{hasAudioModality}
+		{hasVideoModality}
 		{hasVisionModality}
 		{hasMcpPromptsSupport}
 		{hasMcpResourcesSupport}
@@ -52,6 +55,7 @@
 	<ChatFormActionAddDropdown
 		{disabled}
 		{hasAudioModality}
+		{hasVideoModality}
 		{hasVisionModality}
 		{hasMcpPromptsSupport}
 		{hasMcpResourcesSupport}
diff --git a/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionModels.svelte b/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionModels.svelte
index bdd84a481..2f9471e0d 100644
--- a/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionModels.svelte
+++ b/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionModels.svelte
@@ -11,6 +11,7 @@
 		disabled?: boolean;
 		forceForegroundText?: boolean;
 		hasAudioModality?: boolean;
+		hasVideoModality?: boolean;
 		hasVisionModality?: boolean;
 		hasModelSelected?: boolean;
 		isSelectedModelInCache?: boolean;
@@ -23,6 +24,7 @@
 		disabled = false,
 		forceForegroundText = false,
 		hasAudioModality = $bindable(false),
+		hasVideoModality = $bindable(false),
 		hasVisionModality = $bindable(false),
 		hasModelSelected = $bindable(false),
 		isSelectedModelInCache = $bindable(true),
@@ -95,6 +97,10 @@
 		hasAudioModality = activeModelId ? modelsStore.modelSupportsAudio(activeModelId) : false;
 	});
 
+	$effect(() => {
+		hasVideoModality = activeModelId ? modelsStore.modelSupportsVideo(activeModelId) : false;
+	});
+
 	$effect(() => {
 		void modelPropsVersion;
 
diff --git a/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActions.svelte b/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActions.svelte
index 3945155ff..a94293dd9 100644
--- a/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActions.svelte
+++ b/tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActions.svelte
@@ -66,6 +66,7 @@
 	});
 
 	let hasAudioModality = $state(false);
+	let hasVideoModality = $state(false);
 	let hasVisionModality = $state(false);
 	let hasModelSelected = $state(false);
 	let isSelectedModelInCache = $state(true);
@@ -94,6 +95,7 @@
 			<ChatFormActionsAdd
 				{disabled}
 				{hasAudioModality}
+				{hasVideoModality}
 				{hasVisionModality}
 				{hasMcpPromptsSupport}
 				{hasMcpResourcesSupport}
@@ -111,6 +113,7 @@
 			{disabled}
 			bind:this={selectorModelRef}
 			bind:hasAudioModality
+			bind:hasVideoModality
 			bind:hasVisionModality
 			bind:hasModelSelected
 			bind:isSelectedModelInCache
diff --git a/tools/ui/src/lib/components/app/chat/ChatScreen/ChatScreen.svelte b/tools/ui/src/lib/components/app/chat/ChatScreen/ChatScreen.svelte
index 1351ed0a7..dc3eab134 100644
--- a/tools/ui/src/lib/components/app/chat/ChatScreen/ChatScreen.svelte
+++ b/tools/ui/src/lib/components/app/chat/ChatScreen/ChatScreen.svelte
@@ -144,6 +144,16 @@
 		return false;
 	});
 
+	let hasVideoModality = $derived.by(() => {
+		if (activeModelId) {
+			void modelPropsVersion;
+
+			return modelsStore.modelSupportsVideo(activeModelId);
+		}
+
+		return false;
+	});
+
 	let hasVisionModality = $derived.by(() => {
 		if (activeModelId) {
 			void modelPropsVersion;
@@ -284,7 +294,11 @@
 		}
 
 		// Use model-specific capabilities for file validation
-		const capabilities = { hasVision: hasVisionModality, hasAudio: hasAudioModality };
+		const capabilities = {
+			hasVision: hasVisionModality,
+			hasAudio: hasAudioModality,
+			hasVideo: hasVideoModality
+		};
 		const { supportedFiles, unsupportedFiles, modalityReasons } = filterFilesByModalities(
 			generallySupported,
 			capabilities
@@ -297,6 +311,7 @@
 
 			if (hasVisionModality) supportedTypes.push('images');
 			if (hasAudioModality) supportedTypes.push('audio files');
+			if (hasVideoModality) supportedTypes.push('video files');
 
 			fileErrorData = {
 				generallyUnsupported,
diff --git a/tools/ui/src/lib/constants/attachment-menu.ts b/tools/ui/src/lib/constants/attachment-menu.ts
index dea4d1a39..966f46f41 100644
--- a/tools/ui/src/lib/constants/attachment-menu.ts
+++ b/tools/ui/src/lib/constants/attachment-menu.ts
@@ -52,6 +52,15 @@ export const ATTACHMENT_FILE_ITEMS: AttachmentMenuItem[] = [
 		disabledTooltip: 'Audio files processing requires an audio model',
 		action: AttachmentAction.FILE_UPLOAD
 	},
+	{
+		id: AttachmentMenuItemId.VIDEO,
+		label: 'Video Files',
+		icon: FILE_TYPE_ICONS.video,
+		class: 'video-button',
+		enabledWhen: AttachmentItemEnabledWhen.HAS_VIDEO_MODALITY,
+		disabledTooltip: 'Video files processing requires a video model',
+		action: AttachmentAction.FILE_UPLOAD
+	},
 	{
 		id: AttachmentMenuItemId.TEXT,
 		label: 'Text Files',
diff --git a/tools/ui/src/lib/constants/icons.ts b/tools/ui/src/lib/constants/icons.ts
index 1e88ab5b3..5a6bfa981 100644
--- a/tools/ui/src/lib/constants/icons.ts
+++ b/tools/ui/src/lib/constants/icons.ts
@@ -8,13 +8,15 @@ import {
 	FileText as FileTextIcon,
 	Image as ImageIcon,
 	Eye as VisionIcon,
-	Mic as AudioIcon
+	Mic as AudioIcon,
+	Video as VideoIcon
 } from '@lucide/svelte';
 import { FileTypeCategory, ModelModality } from '$lib/enums';
 
 export const FILE_TYPE_ICONS = {
 	[FileTypeCategory.IMAGE]: ImageIcon,
 	[FileTypeCategory.AUDIO]: AudioIcon,
+	[FileTypeCategory.VIDEO]: VideoIcon,
 	[FileTypeCategory.TEXT]: FileTextIcon,
 	[FileTypeCategory.PDF]: FileIcon
 } as const;
@@ -23,10 +25,12 @@ export const DEFAULT_FILE_ICON = FileIcon;
 
 export const MODALITY_ICONS = {
 	[ModelModality.VISION]: VisionIcon,
-	[ModelModality.AUDIO]: AudioIcon
+	[ModelModality.AUDIO]: AudioIcon,
+	[ModelModality.VIDEO]: VideoIcon
 } as const;
 
 export const MODALITY_LABELS = {
 	[ModelModality.VISION]: 'Vision',
-	[ModelModality.AUDIO]: 'Audio'
+	[ModelModality.AUDIO]: 'Audio',
+	[ModelModality.VIDEO]: 'Video'
 } as const;
diff --git a/tools/ui/src/lib/constants/supported-file-types.ts b/tools/ui/src/lib/constants/supported-file-types.ts
index 7fc321e54..345054389 100644
--- a/tools/ui/src/lib/constants/supported-file-types.ts
+++ b/tools/ui/src/lib/constants/supported-file-types.ts
@@ -13,10 +13,12 @@ import {
 	FileTypePdf,
 	FileTypeText,
 	MimeTypeAudio,
+	MimeTypeVideo,
 	MimeTypeImage,
 	MimeTypeApplication,
 	MimeTypeText
 } from '$lib/enums';
+import { FileExtensionVideo, FileTypeVideo } from '$lib/enums/files';
 
 // File type configuration using enums
 export const AUDIO_FILE_TYPES = {
@@ -30,6 +32,17 @@ export const AUDIO_FILE_TYPES = {
 	}
 } as const;
 
+export const VIDEO_FILE_TYPES = {
+	[FileTypeVideo.MP4]: {
+		extensions: [FileExtensionVideo.MP4],
+		mimeTypes: [MimeTypeVideo.MP4]
+	},
+	[FileTypeVideo.OGG]: {
+		extensions: [FileExtensionVideo.OGG],
+		mimeTypes: [MimeTypeVideo.OGG]
+	}
+} as const;
+
 export const IMAGE_FILE_TYPES = {
 	[FileTypeImage.JPEG]: {
 		extensions: [FileExtensionImage.JPG, FileExtensionImage.JPEG],
diff --git a/tools/ui/src/lib/enums/attachment.ts b/tools/ui/src/lib/enums/attachment.ts
index 49baf6bae..1c3258cb1 100644
--- a/tools/ui/src/lib/enums/attachment.ts
+++ b/tools/ui/src/lib/enums/attachment.ts
@@ -4,6 +4,7 @@
 export enum AttachmentType {
 	AUDIO = 'AUDIO',
 	IMAGE = 'IMAGE',
+	VIDEO = 'VIDEO',
 	MCP_PROMPT = 'MCP_PROMPT',
 	MCP_RESOURCE = 'MCP_RESOURCE',
 	PDF = 'PDF',
@@ -18,6 +19,7 @@ export enum AttachmentType {
 export enum AttachmentMenuItemId {
 	IMAGES = 'images',
 	AUDIO = 'audio',
+	VIDEO = 'video',
 	TEXT = 'text',
 	PDF = 'pdf',
 	SYSTEM_MESSAGE = 'system-message',
@@ -31,7 +33,8 @@ export enum AttachmentMenuItemId {
 export enum AttachmentItemEnabledWhen {
 	ALWAYS = 'always',
 	HAS_VISION_MODALITY = 'hasVisionModality',
-	HAS_AUDIO_MODALITY = 'hasAudioModality'
+	HAS_AUDIO_MODALITY = 'hasAudioModality',
+	HAS_VIDEO_MODALITY = 'hasVideoModality'
 }
 
 /**
diff --git a/tools/ui/src/lib/enums/chat.ts b/tools/ui/src/lib/enums/chat.ts
index ff67436ab..798fb1bf7 100644
--- a/tools/ui/src/lib/enums/chat.ts
+++ b/tools/ui/src/lib/enums/chat.ts
@@ -39,7 +39,8 @@ export enum MessageType {
 export enum ContentPartType {
 	TEXT = 'text',
 	IMAGE_URL = 'image_url',
-	INPUT_AUDIO = 'input_audio'
+	INPUT_AUDIO = 'input_audio',
+	INPUT_VIDEO = 'input_video'
 }
 
 /**
diff --git a/tools/ui/src/lib/enums/files.ts b/tools/ui/src/lib/enums/files.ts
index cf081485c..5aef3955e 100644
--- a/tools/ui/src/lib/enums/files.ts
+++ b/tools/ui/src/lib/enums/files.ts
@@ -7,6 +7,7 @@
 export enum FileTypeCategory {
 	IMAGE = 'image',
 	AUDIO = 'audio',
+	VIDEO = 'video',
 	PDF = 'pdf',
 	TEXT = 'text'
 }
@@ -33,6 +34,11 @@ export enum FileTypeAudio {
 	WEBM = 'webm'
 }
 
+export enum FileTypeVideo {
+	MP4 = 'mp4',
+	OGG = 'ogg'
+}
+
 export enum FileTypePdf {
 	PDF = 'pdf'
 }
@@ -92,6 +98,11 @@ export enum FileExtensionAudio {
 	WAV = '.wav'
 }
 
+export enum FileExtensionVideo {
+	MP4 = '.mp4',
+	OGG = '.ogg'
+}
+
 export enum FileExtensionPdf {
 	PDF = '.pdf'
 }
@@ -176,6 +187,11 @@ export enum MimeTypeAudio {
 	WEBM_OPUS = 'audio/webm;codecs=opus'
 }
 
+export enum MimeTypeVideo {
+	MP4 = 'video/mp4',
+	OGG = 'video/ogg'
+}
+
 export enum MimeTypeImage {
 	JPEG = 'image/jpeg',
 	JPG = 'image/jpg',
diff --git a/tools/ui/src/lib/enums/index.ts b/tools/ui/src/lib/enums/index.ts
index 56e1d9f4a..3cf81286b 100644
--- a/tools/ui/src/lib/enums/index.ts
+++ b/tools/ui/src/lib/enums/index.ts
@@ -34,6 +34,7 @@ export {
 	UriPattern,
 	MimeTypeApplication,
 	MimeTypeAudio,
+	MimeTypeVideo,
 	MimeTypeImage,
 	MimeTypeText,
 	SpecialFileType
diff --git a/tools/ui/src/lib/enums/model.ts b/tools/ui/src/lib/enums/model.ts
index 7729ecfea..7aa469947 100644
--- a/tools/ui/src/lib/enums/model.ts
+++ b/tools/ui/src/lib/enums/model.ts
@@ -1,5 +1,6 @@
 export enum ModelModality {
 	TEXT = 'TEXT',
 	AUDIO = 'AUDIO',
-	VISION = 'VISION'
+	VISION = 'VISION',
+	VIDEO = 'VIDEO'
 }
diff --git a/tools/ui/src/lib/hooks/use-attachment-menu.svelte.ts b/tools/ui/src/lib/hooks/use-attachment-menu.svelte.ts
index ddb999485..0940ce7b6 100644
--- a/tools/ui/src/lib/hooks/use-attachment-menu.svelte.ts
+++ b/tools/ui/src/lib/hooks/use-attachment-menu.svelte.ts
@@ -4,6 +4,7 @@ import { AttachmentAction } from '$lib/enums';
 export interface AttachmentModalityFlags {
 	hasVisionModality: boolean;
 	hasAudioModality: boolean;
+	hasVideoModality: boolean;
 	hasMcpPromptsSupport: boolean;
 	hasMcpResourcesSupport: boolean;
 }
diff --git a/tools/ui/src/lib/services/chat.service.ts b/tools/ui/src/lib/services/chat.service.ts
index 08649abd2..3e405e9e6 100644
--- a/tools/ui/src/lib/services/chat.service.ts
+++ b/tools/ui/src/lib/services/chat.service.ts
@@ -884,6 +884,25 @@ export class ChatService {
 			});
 		}
 
+		const videoFiles = message.extra.filter(
+			(extra: DatabaseMessageExtra): extra is DatabaseMessageExtraVideoFile =>
+				extra.type === AttachmentType.VIDEO
+		);
+
+		for (const video of videoFiles) {
+			contentParts.push({
+				type: ContentPartType.INPUT_VIDEO,
+				input_video: {
+					data: video.base64Data,
+					format: video.mimeType.includes('mp4')
+						? 'mp4'
+						: video.mimeType.includes('ogg')
+							? 'ogg'
+							: 'auto'
+				}
+			});
+		}
+
 		const pdfFiles = message.extra.filter(
 			(extra: DatabaseMessageExtra): extra is DatabaseMessageExtraPdfFile =>
 				extra.type === AttachmentType.PDF
diff --git a/tools/ui/src/lib/stores/models.svelte.ts b/tools/ui/src/lib/stores/models.svelte.ts
index 63943ff7a..45981b38f 100644
--- a/tools/ui/src/lib/stores/models.svelte.ts
+++ b/tools/ui/src/lib/stores/models.svelte.ts
@@ -148,7 +148,8 @@ class ModelsStore {
 		if (props?.modalities) {
 			return {
 				vision: props.modalities.vision ?? false,
-				audio: props.modalities.audio ?? false
+				audio: props.modalities.audio ?? false,
+				video: props.modalities.video ?? false
 			};
 		}
 
@@ -169,6 +170,13 @@ class ModelsStore {
 		return this.getModelModalities(modelId)?.audio ?? false;
 	}
 
+	/**
+	 * Check if a model supports video modality
+	 */
+	modelSupportsVideo(modelId: string): boolean {
+		return this.getModelModalities(modelId)?.video ?? false;
+	}
+
 	/**
 	 * Get model modalities as an array of ModelModality enum values
 	 */
@@ -180,6 +188,7 @@ class ModelsStore {
 
 		if (modalities.vision) result.push(ModelModality.VISION);
 		if (modalities.audio) result.push(ModelModality.AUDIO);
+		if (modalities.video) result.push(ModelModality.VIDEO);
 
 		return result;
 	}
@@ -316,7 +325,8 @@ class ModelsStore {
 			if (serverStore.isModelMode && this.models.length > 0 && serverProps?.modalities) {
 				const modalities: ModelModalities = {
 					vision: serverProps.modalities.vision ?? false,
-					audio: serverProps.modalities.audio ?? false
+					audio: serverProps.modalities.audio ?? false,
+					video: serverProps.modalities.video ?? false
 				};
 				this.modelPropsCache.set(this.models[0].model, serverProps);
 				this.models = this.models.map((model, index) =>
@@ -410,7 +420,8 @@ class ModelsStore {
 
 				const modalities: ModelModalities = {
 					vision: props.modalities.vision ?? false,
-					audio: props.modalities.audio ?? false
+					audio: props.modalities.audio ?? false,
+					video: props.modalities.video ?? false
 				};
 
 				return { ...model, modalities };
@@ -529,7 +540,8 @@ class ModelsStore {
 
 			const modalities: ModelModalities = {
 				vision: props.modalities.vision ?? false,
-				audio: props.modalities.audio ?? false
+				audio: props.modalities.audio ?? false,
+				video: props.modalities.video ?? false
 			};
 
 			this.models = this.models.map((model) =>
diff --git a/tools/ui/src/lib/types/api.d.ts b/tools/ui/src/lib/types/api.d.ts
index 808c44203..316ad5528 100644
--- a/tools/ui/src/lib/types/api.d.ts
+++ b/tools/ui/src/lib/types/api.d.ts
@@ -22,6 +22,10 @@ export interface ApiChatMessageContentPart {
 		data: string;
 		format: 'wav' | 'mp3';
 	};
+	input_video?: {
+		data: string;
+		format: 'mp4' | 'ogg' | 'auto';
+	};
 }
 
 export interface ApiContextSizeError {
@@ -190,6 +194,7 @@ export interface ApiLlamaCppServerProps {
 	modalities: {
 		vision: boolean;
 		audio: boolean;
+		video: boolean;
 	};
 	chat_template: string;
 	bos_token: string;
diff --git a/tools/ui/src/lib/types/common.d.ts b/tools/ui/src/lib/types/common.d.ts
index 453d0cd74..6de33aaaf 100644
--- a/tools/ui/src/lib/types/common.d.ts
+++ b/tools/ui/src/lib/types/common.d.ts
@@ -64,4 +64,9 @@ export interface ParsedClipboardContent {
 	mcpPromptAttachments: ClipboardMcpPromptAttachment[];
 }
 
-export type MimeTypeUnion = MimeTypeAudio | MimeTypeImage | MimeTypeApplication | MimeTypeText;
+export type MimeTypeUnion =
+	| MimeTypeAudio
+	| MimeTypeVideo
+	| MimeTypeImage
+	| MimeTypeApplication
+	| MimeTypeText;
diff --git a/tools/ui/src/lib/types/database.d.ts b/tools/ui/src/lib/types/database.d.ts
index 044bd27ac..02bdb3ee6 100644
--- a/tools/ui/src/lib/types/database.d.ts
+++ b/tools/ui/src/lib/types/database.d.ts
@@ -23,6 +23,14 @@ export interface DatabaseMessageExtraAudioFile {
 	mimeType: string;
 }
 
+export interface DatabaseMessageExtraVideoFile {
+	type: AttachmentType.VIDEO;
+	name: string;
+	size?: number;
+	base64Data: string;
+	mimeType: string;
+}
+
 export interface DatabaseMessageExtraImageFile {
 	type: AttachmentType.IMAGE;
 	name: string;
@@ -82,6 +90,7 @@ export type DatabaseMessageExtra =
 	| DatabaseMessageExtraImageFile
 	| DatabaseMessageExtraTextFile
 	| DatabaseMessageExtraAudioFile
+	| DatabaseMessageExtraVideoFile
 	| DatabaseMessageExtraPdfFile
 	| DatabaseMessageExtraMcpPrompt
 	| DatabaseMessageExtraMcpResource
diff --git a/tools/ui/src/lib/types/index.ts b/tools/ui/src/lib/types/index.ts
index 03cb9c5a5..d704a4b3c 100644
--- a/tools/ui/src/lib/types/index.ts
+++ b/tools/ui/src/lib/types/index.ts
@@ -55,6 +55,7 @@ export type {
 	McpServerOverride,
 	DatabaseConversation,
 	DatabaseMessageExtraAudioFile,
+	DatabaseMessageExtraVideoFile,
 	DatabaseMessageExtraImageFile,
 	DatabaseMessageExtraLegacyContext,
 	DatabaseMessageExtraMcpPrompt,
diff --git a/tools/ui/src/lib/types/models.d.ts b/tools/ui/src/lib/types/models.d.ts
index b4d5f11f5..51069599d 100644
--- a/tools/ui/src/lib/types/models.d.ts
+++ b/tools/ui/src/lib/types/models.d.ts
@@ -3,6 +3,7 @@ import type { ApiModelDataEntry, ApiModelDetails } from '$lib/types/api';
 export interface ModelModalities {
 	vision: boolean;
 	audio: boolean;
+	video: boolean;
 }
 
 export interface ModelOption {
@@ -35,4 +36,5 @@ export interface ParsedModelId {
 export interface ModalityCapabilities {
 	hasVision: boolean;
 	hasAudio: boolean;
+	hasVideo: boolean;
 }
diff --git a/tools/ui/src/lib/utils/attachment-type.ts b/tools/ui/src/lib/utils/attachment-type.ts
index 9e9f09601..d595afa6b 100644
--- a/tools/ui/src/lib/utils/attachment-type.ts
+++ b/tools/ui/src/lib/utils/attachment-type.ts
@@ -103,3 +103,24 @@ export function isAudioFile(
 
 	return false;
 }
+
+/**
+ * Determines if an attachment or uploaded file is a video file
+ * @param uploadedFile - Optional uploaded file
+ * @param attachment - Optional database attachment
+ * @returns true if the file is a video file
+ */
+export function isVideoFile(
+	attachment?: DatabaseMessageExtra,
+	uploadedFile?: ChatUploadedFile
+): boolean {
+	if (uploadedFile) {
+		return getUploadedFileCategory(uploadedFile) === FileTypeCategory.VIDEO;
+	}
+
+	if (attachment) {
+		return attachment.type === AttachmentType.VIDEO;
+	}
+
+	return false;
+}
diff --git a/tools/ui/src/lib/utils/convert-files-to-extra.ts b/tools/ui/src/lib/utils/convert-files-to-extra.ts
index 12be45485..af404445f 100644
--- a/tools/ui/src/lib/utils/convert-files-to-extra.ts
+++ b/tools/ui/src/lib/utils/convert-files-to-extra.ts
@@ -89,6 +89,21 @@ export async function parseFilesToMessageExtras(
 			} catch (error) {
 				console.error(`Failed to process audio file ${file.name}:`, error);
 			}
+		} else if (getFileTypeCategory(file.type) === FileTypeCategory.VIDEO) {
+			// Process video files (MP4, etc)
+			try {
+				const base64Data = await readFileAsBase64(file.file);
+
+				extras.push({
+					type: AttachmentType.VIDEO,
+					name: file.name,
+					size: file.size,
+					base64Data: base64Data,
+					mimeType: file.type
+				});
+			} catch (error) {
+				console.error(`Failed to process video file ${file.name}:`, error);
+			}
 		} else if (getFileTypeCategory(file.type) === FileTypeCategory.PDF) {
 			try {
 				// Always get base64 data for preview functionality
diff --git a/tools/ui/src/lib/utils/file-type.ts b/tools/ui/src/lib/utils/file-type.ts
index 4c670600c..ae814e805 100644
--- a/tools/ui/src/lib/utils/file-type.ts
+++ b/tools/ui/src/lib/utils/file-type.ts
@@ -1,5 +1,6 @@
 import {
 	AUDIO_FILE_TYPES,
+	VIDEO_FILE_TYPES,
 	IMAGE_FILE_TYPES,
 	PDF_FILE_TYPES,
 	TEXT_FILE_TYPES
@@ -12,6 +13,7 @@ import {
 	FileTypeCategory,
 	MimeTypeApplication,
 	MimeTypeAudio,
+	MimeTypeVideo,
 	MimeTypeImage,
 	MimeTypeText
 } from '$lib/enums';
@@ -35,6 +37,11 @@ export function getFileTypeCategory(mimeType: string): FileTypeCategory | null {
 		case MimeTypeAudio.WEBM_OPUS:
 			return FileTypeCategory.AUDIO;
 
+		// Video
+		case MimeTypeVideo.MP4:
+		case MimeTypeVideo.OGG:
+			return FileTypeCategory.VIDEO;
+
 		// PDF
 		case MimeTypeApplication.PDF:
 			return FileTypeCategory.PDF;
@@ -179,6 +186,12 @@ export function getFileTypeByExtension(filename: string): string | null {
 		}
 	}
 
+	for (const [key, type] of Object.entries(VIDEO_FILE_TYPES)) {
+		if ((type.extensions as readonly string[]).includes(extension)) {
+			return `${FileTypeCategory.VIDEO}:${key}`;
+		}
+	}
+
 	for (const [key, type] of Object.entries(PDF_FILE_TYPES)) {
 		if ((type.extensions as readonly string[]).includes(extension)) {
 			return `${FileTypeCategory.PDF}:${key}`;
diff --git a/tools/ui/src/lib/utils/index.ts b/tools/ui/src/lib/utils/index.ts
index 1c7b5476a..00aa49c41 100644
--- a/tools/ui/src/lib/utils/index.ts
+++ b/tools/ui/src/lib/utils/index.ts
@@ -14,7 +14,7 @@ export { validateApiKey } from './api-key-validation';
 
 // Attachment utilities
 export { getAttachmentDisplayItems, isMcpPrompt, isMcpResource } from './attachment-display';
-export { isTextFile, isImageFile, isPdfFile, isAudioFile } from './attachment-type';
+export { isTextFile, isImageFile, isPdfFile, isAudioFile, isVideoFile } from './attachment-type';
 
 // Textarea utilities
 export { default as autoResizeTextarea } from './autoresize-textarea';
diff --git a/tools/ui/src/lib/utils/modality-file-validation.ts b/tools/ui/src/lib/utils/modality-file-validation.ts
index 9b52e93db..bf78a7008 100644
--- a/tools/ui/src/lib/utils/modality-file-validation.ts
+++ b/tools/ui/src/lib/utils/modality-file-validation.ts
@@ -45,6 +45,10 @@ export function isFileTypeSupportedByModel(
 			// Audio files require audio support
 			return capabilities.hasAudio;
 
+		case FileTypeCategory.VIDEO:
+			// Video files require video support
+			return capabilities.hasVideo;
+
 		default:
 			// Unknown categories - be conservative and allow
 			return true;
@@ -69,7 +73,7 @@ export function filterFilesByModalities(
 	const unsupportedFiles: File[] = [];
 	const modalityReasons: Record<string, string> = {};
 
-	const { hasVision, hasAudio } = capabilities;
+	const { hasVision, hasAudio, hasVideo } = capabilities;
 
 	for (const file of files) {
 		const category = getFileTypeCategory(file.type);
@@ -91,6 +95,13 @@ export function filterFilesByModalities(
 				}
 				break;
 
+			case FileTypeCategory.VIDEO:
+				if (!hasVideo) {
+					isSupported = false;
+					reason = 'Video files require a video-capable model';
+				}
+				break;
+
 			case FileTypeCategory.TEXT:
 			case FileTypeCategory.PDF:
 				// Always supported
@@ -127,7 +138,7 @@ export function generateModalityErrorMessage(
 ): string {
 	if (unsupportedFiles.length === 0) return '';
 
-	const { hasVision, hasAudio } = capabilities;
+	const { hasVision, hasAudio, hasVideo } = capabilities;
 
 	let message = '';
 
@@ -144,6 +155,7 @@ export function generateModalityErrorMessage(
 	const supportedTypes: string[] = ['text files', 'PDFs'];
 	if (hasVision) supportedTypes.push('images');
 	if (hasAudio) supportedTypes.push('audio files');
+	if (hasVideo) supportedTypes.push('video files');
 
 	message += ` This model supports: ${supportedTypes.join(', ')}.`;
 
diff --git a/tools/ui/src/lib/utils/process-uploaded-files.ts b/tools/ui/src/lib/utils/process-uploaded-files.ts
index 1f4068aee..d0110f6cb 100644
--- a/tools/ui/src/lib/utils/process-uploaded-files.ts
+++ b/tools/ui/src/lib/utils/process-uploaded-files.ts
@@ -117,6 +117,10 @@ export async function processFilesToChatUploaded(
 				// Generate preview URL for audio files
 				const preview = await readFileAsDataURL(file);
 				results.push({ ...base, preview });
+			} else if (getFileTypeCategory(file.type) === FileTypeCategory.VIDEO) {
+				// Generate preview URL for video files
+				const preview = await readFileAsDataURL(file);
+				results.push({ ...base, preview });
 			} else {
 				// Fallback: treat unknown files as text
 				try {
diff --git a/tools/ui/tests/stories/fixtures/storybook-mocks.ts b/tools/ui/tests/stories/fixtures/storybook-mocks.ts
index c40a74655..ecfcdf09d 100644
--- a/tools/ui/tests/stories/fixtures/storybook-mocks.ts
+++ b/tools/ui/tests/stories/fixtures/storybook-mocks.ts
@@ -15,7 +15,8 @@ export function mockServerProps(props: Partial<ApiLlamaCppServerProps>): void {
 		model_path: props.model_path || 'test-model',
 		modalities: {
 			vision: props.modalities?.vision ?? false,
-			audio: props.modalities?.audio ?? false
+			audio: props.modalities?.audio ?? false,
+			video: props.modalities?.video ?? false
 		},
 		...props
 	} as ApiLlamaCppServerProps;
@@ -26,11 +27,14 @@ export function mockServerProps(props: Partial<ApiLlamaCppServerProps>): void {
 	// Also mock modelsStore methods for modality checking
 	const vision = props.modalities?.vision ?? false;
 	const audio = props.modalities?.audio ?? false;
+	const video = props.modalities?.video ?? false;
 
 	// eslint-disable-next-line @typescript-eslint/no-explicit-any
 	(modelsStore as any).modelSupportsVision = () => vision;
 	// eslint-disable-next-line @typescript-eslint/no-explicit-any
 	(modelsStore as any).modelSupportsAudio = () => audio;
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
+	(modelsStore as any).modelSupportsVideo = () => video;
 
 	// Mock models list with a test model so activeModelId can be resolved
 	// eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -55,7 +59,8 @@ export function resetServerStore(): void {
 		model_path: '',
 		modalities: {
 			vision: false,
-			audio: false
+			audio: false,
+			video: false
 		}
 	} as ApiLlamaCppServerProps;
 	(serverStore as unknown as { error: string }).error = '';
@@ -76,6 +81,6 @@ export const mockConfigs = {
 		modalities: { vision: true, audio: true }
 	},
 	noModalities: {
-		modalities: { vision: false, audio: false }
+		modalities: { vision: false, audio: false, video: false }
 	}
 } as const;