diff --git a/keyserver/src/endpoints.js b/keyserver/src/endpoints.js
--- a/keyserver/src/endpoints.js
+++ b/keyserver/src/endpoints.js
@@ -63,7 +63,10 @@
   updateUserAvatarResponder,
 } from './responders/user-responders.js';
 import { codeVerificationResponder } from './responders/verification-responders.js';
-import { uploadDeletionResponder } from './uploads/uploads.js';
+import {
+  uploadMediaMetadataResponder,
+  uploadDeletionResponder,
+} from './uploads/uploads.js';
 
 const jsonEndpoints: { [id: Endpoint]: JSONResponder } = {
   create_account: {
@@ -262,6 +265,10 @@
     responder: updateUserAvatarResponder,
     requiredPolicies: baseLegalPolicies,
   },
+  upload_media_metadata: {
+    responder: uploadMediaMetadataResponder,
+    requiredPolicies: baseLegalPolicies,
+  },
 };
 
 export { jsonEndpoints };
diff --git a/lib/actions/upload-actions.js b/lib/actions/upload-actions.js
--- a/lib/actions/upload-actions.js
+++ b/lib/actions/upload-actions.js
@@ -2,9 +2,10 @@
 
 import type { Shape } from '../types/core.js';
 import type {
+  UploadMediaMetadataRequest,
   UploadMultimediaResult,
   Dimensions,
-} from '../types/media-types.js';
+} from '../types/media-types';
 import type { CallServerEndpoint } from '../utils/call-server-endpoint.js';
 import type { UploadBlob } from '../utils/upload-blob.js';
 
@@ -19,6 +20,21 @@
   encryptionKey?: string,
 }>;
 
+const uploadMediaMetadata =
+  (
+    callServerEndpoint: CallServerEndpoint,
+  ): ((input: UploadMediaMetadataRequest) => Promise<UploadMultimediaResult>) =>
+  async input => {
+    const response = await callServerEndpoint('upload_media_metadata', input);
+    return {
+      id: response.id,
+      uri: response.uri,
+      mediaType: response.mediaType,
+      dimensions: response.dimensions,
+      loop: response.loop,
+    };
+  };
+
 const uploadMultimedia =
   (
     callServerEndpoint: CallServerEndpoint,
@@ -84,6 +100,7 @@
 
 export {
   uploadMultimedia,
+  uploadMediaMetadata,
   updateMultimediaMessageMediaActionType,
   deleteUpload,
 };
diff --git a/lib/types/endpoints.js b/lib/types/endpoints.js
--- a/lib/types/endpoints.js
+++ b/lib/types/endpoints.js
@@ -87,6 +87,7 @@
   SIWE_NONCE: 'siwe_nonce',
   SIWE_AUTH: 'siwe_auth',
   UPDATE_USER_AVATAR: 'update_user_avatar',
+  UPLOAD_MEDIA_METADATA: 'upload_media_metadata',
 });
 type SocketPreferredEndpoint = $Values<typeof socketPreferredEndpoints>;