diff --git a/client/src/components/Chat/Input/Files/AttachFileMenu.tsx b/client/src/components/Chat/Input/Files/AttachFileMenu.tsx
index f34303047a..6e57759e16 100644
--- a/client/src/components/Chat/Input/Files/AttachFileMenu.tsx
+++ b/client/src/components/Chat/Input/Files/AttachFileMenu.tsx
@@ -9,6 +9,7 @@ import {
   TerminalSquareIcon,
 } from 'lucide-react';
 import {
+  Providers,
   EToolResources,
   EModelEndpoint,
   defaultAgentCapabilities,
@@ -36,6 +37,8 @@ import { ephemeralAgentByConvoId } from '~/store';
 import { MenuItemProps } from '~/common';
 import { cn } from '~/utils';
 
+type FileUploadType = 'image' | 'document' | 'image_document' | 'image_document_video_audio';
+
 interface AttachFileMenuProps {
   agentId?: string | null;
   endpoint?: string | null;
@@ -83,9 +86,7 @@ const AttachFileMenu = ({
     ephemeralAgent,
   );
 
-  const handleUploadClick = (
-    fileType?: 'image' | 'document' | 'multimodal' | 'google_multimodal',
-  ) => {
+  const handleUploadClick = (fileType?: FileUploadType) => {
     if (!inputRef.current) {
       return;
     }
@@ -94,9 +95,9 @@ const AttachFileMenu = ({
       inputRef.current.accept = 'image/*';
     } else if (fileType === 'document') {
       inputRef.current.accept = '.pdf,application/pdf';
-    } else if (fileType === 'multimodal') {
+    } else if (fileType === 'image_document') {
       inputRef.current.accept = 'image/*,.pdf,application/pdf';
-    } else if (fileType === 'google_multimodal') {
+    } else if (fileType === 'image_document_video_audio') {
       inputRef.current.accept = 'image/*,.pdf,application/pdf,video/*,audio/*';
     } else {
       inputRef.current.accept = '';
@@ -106,12 +107,16 @@ const AttachFileMenu = ({
   };
 
   const dropdownItems = useMemo(() => {
-    const createMenuItems = (
-      onAction: (fileType?: 'image' | 'document' | 'multimodal' | 'google_multimodal') => void,
-    ) => {
+    const createMenuItems = (onAction: (fileType?: FileUploadType) => void) => {
       const items: MenuItemProps[] = [];
 
-      const currentProvider = provider || endpoint;
+      let currentProvider = provider || endpoint;
+
+      // This will be removed in a future PR to formally normalize Providers comparisons to be case insensitive
+      if (currentProvider?.toLowerCase() === Providers.OPENROUTER) {
+        currentProvider = Providers.OPENROUTER;
+      }
+
       if (
         isDocumentSupportedProvider(endpointType) ||
         isDocumentSupportedProvider(currentProvider)
@@ -120,9 +125,11 @@ const AttachFileMenu = ({
           label: localize('com_ui_upload_provider'),
           onClick: () => {
             setToolResource(undefined);
-            onAction(
-              (provider || endpoint) === EModelEndpoint.google ? 'google_multimodal' : 'multimodal',
-            );
+            let fileType: Exclude<FileUploadType, 'image' | 'document'> = 'image_document';
+            if (currentProvider === Providers.GOOGLE || currentProvider === Providers.OPENROUTER) {
+              fileType = 'image_document_video_audio';
+            }
+            onAction(fileType);
           },
           icon: <FileImageIcon className="icon-md" />,
         });
diff --git a/client/src/components/Chat/Input/Files/DragDropModal.tsx b/client/src/components/Chat/Input/Files/DragDropModal.tsx
index eb5f86d3b9..65647a2f22 100644
--- a/client/src/components/Chat/Input/Files/DragDropModal.tsx
+++ b/client/src/components/Chat/Input/Files/DragDropModal.tsx
@@ -2,6 +2,7 @@ import React, { useMemo } from 'react';
 import { useRecoilValue } from 'recoil';
 import { OGDialog, OGDialogTemplate } from '@librechat/client';
 import {
+  Providers,
   inferMimeType,
   EToolResources,
   EModelEndpoint,
@@ -55,15 +56,21 @@ const DragDropModal = ({ onOptionSelect, setShowModal, files, isVisible }: DragD
 
   const options = useMemo(() => {
     const _options: FileOption[] = [];
-    const currentProvider = provider || endpoint;
+    let currentProvider = provider || endpoint;
+
+    // This will be removed in a future PR to formally normalize Providers comparisons to be case insensitive
+    if (currentProvider?.toLowerCase() === Providers.OPENROUTER) {
+      currentProvider = Providers.OPENROUTER;
+    }
 
     /** Helper to get inferred MIME type for a file */
     const getFileType = (file: File) => inferMimeType(file.name, file.type);
 
     // Check if provider supports document upload
     if (isDocumentSupportedProvider(endpointType) || isDocumentSupportedProvider(currentProvider)) {
-      const isGoogleProvider = currentProvider === EModelEndpoint.google;
-      const validFileTypes = isGoogleProvider
+      const supportsImageDocVideoAudio =
+        currentProvider === EModelEndpoint.google || currentProvider === Providers.OPENROUTER;
+      const validFileTypes = supportsImageDocVideoAudio
         ? files.every((file) => {
             const type = getFileType(file);
             return (
diff --git a/client/src/components/Chat/Input/Files/__tests__/AttachFileMenu.spec.tsx b/client/src/components/Chat/Input/Files/__tests__/AttachFileMenu.spec.tsx
index 36c4ee40e7..a9b7139737 100644
--- a/client/src/components/Chat/Input/Files/__tests__/AttachFileMenu.spec.tsx
+++ b/client/src/components/Chat/Input/Files/__tests__/AttachFileMenu.spec.tsx
@@ -512,7 +512,7 @@ describe('AttachFileMenu', () => {
   });
 
   describe('Google Provider Special Case', () => {
-    it('should use google_multimodal file type for Google provider', () => {
+    it('should use image_document_video_audio file type for Google provider', () => {
       mockUseAgentToolPermissions.mockReturnValue({
         fileSearchAllowedByAgent: false,
         codeAllowedByAgent: false,
@@ -536,7 +536,7 @@ describe('AttachFileMenu', () => {
       // The file input should have been clicked (indirectly tested through the implementation)
     });
 
-    it('should use multimodal file type for non-Google providers', () => {
+    it('should use image_document file type for non-Google providers', () => {
       mockUseAgentToolPermissions.mockReturnValue({
         fileSearchAllowedByAgent: false,
         codeAllowedByAgent: false,
@@ -555,7 +555,7 @@ describe('AttachFileMenu', () => {
       expect(uploadProviderButton).toBeInTheDocument();
       fireEvent.click(uploadProviderButton);
 
-      // Implementation detail - multimodal type is used
+      // Implementation detail - image_document type is used
     });
   });
 
diff --git a/packages/api/src/files/encode/audio.ts b/packages/api/src/files/encode/audio.ts
index 6018df497d..d29163d868 100644
--- a/packages/api/src/files/encode/audio.ts
+++ b/packages/api/src/files/encode/audio.ts
@@ -79,6 +79,21 @@ export async function encodeAndFormatAudios(
         mimeType: file.type,
         data: content,
       });
+    } else if (provider === Providers.OPENROUTER) {
+      // Extract format from filename extension (e.g., 'audio.mp3' -> 'mp3')
+      // OpenRouter expects format values like: wav, mp3, aiff, aac, ogg, flac, m4a, pcm16, pcm24
+      // Note: MIME types don't always match (e.g., 'audio/mpeg' is mp3, not mpeg), so that is why we are using the file extension instead
+      const format = file.filename.split('.').pop()?.toLowerCase();
+      if (!format) {
+        throw new Error(`Could not extract audio format from filename: ${file.filename}`);
+      }
+      result.audios.push({
+        type: 'input_audio',
+        input_audio: {
+          data: content,
+          format,
+        },
+      });
     }
 
     result.files.push(metadata);
diff --git a/packages/api/src/files/encode/video.ts b/packages/api/src/files/encode/video.ts
index faace9eca1..b0d9bb8c2d 100644
--- a/packages/api/src/files/encode/video.ts
+++ b/packages/api/src/files/encode/video.ts
@@ -79,6 +79,13 @@ export async function encodeAndFormatVideos(
         mimeType: file.type,
         data: content,
       });
+    } else if (provider === Providers.OPENROUTER) {
+      result.videos.push({
+        type: 'video_url',
+        video_url: {
+          url: `data:${file.type};base64,${content}`,
+        },
+      });
     }
 
     result.files.push(metadata);
diff --git a/packages/api/src/types/files.ts b/packages/api/src/types/files.ts
index 7ee641aab1..6a403932da 100644
--- a/packages/api/src/types/files.ts
+++ b/packages/api/src/types/files.ts
@@ -29,12 +29,25 @@ export interface AudioProcessingResult {
   bytes: number;
 }
 
+/** Google video block format */
+export interface GoogleVideoBlock {
+  type: 'media';
+  mimeType: string;
+  data: string;
+}
+
+/** OpenRouter video block format */
+export interface OpenRouterVideoBlock {
+  type: 'video_url';
+  video_url: {
+    url: string;
+  };
+}
+
+export type VideoBlock = GoogleVideoBlock | OpenRouterVideoBlock;
+
 export interface VideoResult {
-  videos: Array<{
-    type: string;
-    mimeType: string;
-    data: string;
-  }>;
+  videos: VideoBlock[];
   files: Array<{
     file_id?: string;
     temp_file_id?: string;
@@ -100,12 +113,26 @@ export interface DocumentResult {
   }>;
 }
 
-export interface AudioResult {
-  audios: Array<{
-    type: string;
-    mimeType: string;
+/** Google audio block format */
+export interface GoogleAudioBlock {
+  type: 'media';
+  mimeType: string;
+  data: string;
+}
+
+/** OpenRouter audio block format */
+export interface OpenRouterAudioBlock {
+  type: 'input_audio';
+  input_audio: {
     data: string;
-  }>;
+    format: string;
+  };
+}
+
+export type AudioBlock = GoogleAudioBlock | OpenRouterAudioBlock;
+
+export interface AudioResult {
+  audios: AudioBlock[];
   files: Array<{
     file_id?: string;
     temp_file_id?: string;
diff --git a/packages/data-provider/src/types/agents.ts b/packages/data-provider/src/types/agents.ts
index 7305d2f062..ac3f464019 100644
--- a/packages/data-provider/src/types/agents.ts
+++ b/packages/data-provider/src/types/agents.ts
@@ -33,11 +33,26 @@ export namespace Agents {
     image_url: string | { url: string; detail?: ImageDetail };
   };
 
+  export type MessageContentVideoUrl = {
+    type: ContentTypes.VIDEO_URL;
+    video_url: { url: string };
+  };
+
+  export type MessageContentInputAudio = {
+    type: ContentTypes.INPUT_AUDIO;
+    input_audio: {
+      data: string;
+      format: string;
+    };
+  };
+
   export type MessageContentComplex =
     | ReasoningContentText
     | AgentUpdate
     | MessageContentText
     | MessageContentImageUrl
+    | MessageContentVideoUrl
+    | MessageContentInputAudio
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     | (Record<string, any> & { type?: ContentTypes | string })
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -295,6 +310,8 @@ export namespace Agents {
     | ContentTypes.THINK
     | ContentTypes.TEXT
     | ContentTypes.IMAGE_URL
+    | ContentTypes.VIDEO_URL
+    | ContentTypes.INPUT_AUDIO
     | string;
 }
 
diff --git a/packages/data-provider/src/types/assistants.ts b/packages/data-provider/src/types/assistants.ts
index b0ed1f01c1..185df5fa9f 100644
--- a/packages/data-provider/src/types/assistants.ts
+++ b/packages/data-provider/src/types/assistants.ts
@@ -515,7 +515,9 @@ export type TMessageContentParts =
     } & ContentMetadata)
   | ({ type: ContentTypes.IMAGE_FILE; image_file: ImageFile & PartMetadata } & ContentMetadata)
   | (Agents.AgentUpdate & ContentMetadata)
-  | (Agents.MessageContentImageUrl & ContentMetadata);
+  | (Agents.MessageContentImageUrl & ContentMetadata)
+  | (Agents.MessageContentVideoUrl & ContentMetadata)
+  | (Agents.MessageContentInputAudio & ContentMetadata);
 
 export type StreamContentData = TMessageContentParts & {
   /** The index of the current content part */
diff --git a/packages/data-provider/src/types/runs.ts b/packages/data-provider/src/types/runs.ts
index bba5126054..de61357b92 100644
--- a/packages/data-provider/src/types/runs.ts
+++ b/packages/data-provider/src/types/runs.ts
@@ -5,6 +5,8 @@ export enum ContentTypes {
   TOOL_CALL = 'tool_call',
   IMAGE_FILE = 'image_file',
   IMAGE_URL = 'image_url',
+  VIDEO_URL = 'video_url',
+  INPUT_AUDIO = 'input_audio',
   AGENT_UPDATE = 'agent_update',
   ERROR = 'error',
 }