diff --git a/lib/actions/message-actions.js b/lib/actions/message-actions.js
--- a/lib/actions/message-actions.js
+++ b/lib/actions/message-actions.js
@@ -7,6 +7,7 @@
   SendMessageResult,
   SimpleMessagesPayload,
 } from '../types/message-types';
+import type { MediaMessageServerDBContent } from '../types/messages/media.js';
 import type { FetchJSON, FetchResultInfo } from '../utils/fetch-json';
 
 const fetchMessagesBeforeCursorActionTypes = Object.freeze({
@@ -124,6 +125,42 @@
   success: 'SEND_MULTIMEDIA_MESSAGE_SUCCESS',
   failed: 'SEND_MULTIMEDIA_MESSAGE_FAILED',
 });
+const sendMultimediaMessage = (
+  fetchJSON: FetchJSON,
+): ((
+  threadID: string,
+  localID: string,
+  mediaMessageContents: $ReadOnlyArray<MediaMessageServerDBContent>,
+) => Promise<SendMessageResult>) => async (
+  threadID,
+  localID,
+  mediaMessageContents,
+) => {
+  let resultInfo;
+  const getResultInfo = (passedResultInfo: FetchResultInfo) => {
+    resultInfo = passedResultInfo;
+  };
+  const response = await fetchJSON(
+    'create_multimedia_message',
+    {
+      threadID,
+      localID,
+      mediaMessageContents,
+    },
+    { getResultInfo },
+  );
+  const resultInterface = resultInfo?.interface;
+  invariant(
+    resultInterface,
+    'getResultInfo not called before fetchJSON resolves',
+  );
+  return {
+    id: response.newMessageInfo.id,
+    time: response.newMessageInfo.time,
+    interface: resultInterface,
+  };
+};
+
 const legacySendMultimediaMessage = (
   fetchJSON: FetchJSON,
 ): ((
@@ -172,6 +209,7 @@
   sendTextMessage,
   createLocalMessageActionType,
   sendMultimediaMessageActionTypes,
+  sendMultimediaMessage,
   legacySendMultimediaMessage,
   saveMessagesActionType,
   processMessagesActionType,
diff --git a/native/input/input-state-container.react.js b/native/input/input-state-container.react.js
--- a/native/input/input-state-container.react.js
+++ b/native/input/input-state-container.react.js
@@ -10,7 +10,7 @@
 import {
   createLocalMessageActionType,
   sendMultimediaMessageActionTypes,
-  legacySendMultimediaMessage,
+  sendMultimediaMessage,
   sendTextMessageActionTypes,
   sendTextMessage,
 } from 'lib/actions/message-actions';
@@ -54,7 +54,10 @@
   type SendMessagePayload,
 } from 'lib/types/message-types';
 import type { RawImagesMessageInfo } from 'lib/types/messages/images';
-import type { RawMediaMessageInfo } from 'lib/types/messages/media';
+import type {
+  MediaMessageServerDBContent,
+  RawMediaMessageInfo,
+} from 'lib/types/messages/media';
 import type { RawTextMessageInfo } from 'lib/types/messages/text';
 import type { Dispatch } from 'lib/types/redux-types';
 import {
@@ -122,7 +125,7 @@
   +sendMultimediaMessage: (
     threadID: string,
     localID: string,
-    mediaIDs: $ReadOnlyArray<string>,
+    mediaMessageContents: $ReadOnlyArray<MediaMessageServerDBContent>,
   ) => Promise<SendMessageResult>,
   +sendTextMessage: (
     threadID: string,
@@ -324,15 +327,25 @@
       localID !== null && localID !== undefined,
       'localID should be set',
     );
-    const mediaIDs = [];
-    for (const { id } of messageInfo.media) {
-      mediaIDs.push(id);
-    }
+    const mediaMessageContents: MediaMessageServerDBContent[] = messageInfo.media.map(
+      media => {
+        if (media.type === 'photo') {
+          return { type: 'photo', uploadID: media.id };
+        } else {
+          return {
+            type: 'video',
+            uploadID: media.id,
+            thumbnailUploadID: media.thumbnailID,
+          };
+        }
+      },
+    );
+
     try {
       const result = await this.props.sendMultimediaMessage(
         threadID,
         localID,
-        mediaIDs,
+        mediaMessageContents,
       );
       return {
         localID,
@@ -1383,9 +1396,7 @@
     const hasWiFi = useSelector(state => state.connectivity.hasWiFi);
     const calendarQuery = useCalendarQuery();
     const callUploadMultimedia = useServerCall(uploadMultimedia);
-    const callSendMultimediaMessage = useServerCall(
-      legacySendMultimediaMessage,
-    );
+    const callSendMultimediaMessage = useServerCall(sendMultimediaMessage);
     const callSendTextMessage = useServerCall(sendTextMessage);
     const callNewThread = useServerCall(newThread);
     const dispatchActionPromise = useDispatchActionPromise();