diff --git a/lib/shared/messages/multimedia-message-spec.js b/lib/shared/messages/multimedia-message-spec.js
--- a/lib/shared/messages/multimedia-message-spec.js
+++ b/lib/shared/messages/multimedia-message-spec.js
@@ -25,9 +25,9 @@
 import type {
   MediaMessageData,
   MediaMessageInfo,
-  MediaMessageServerDBContent,
   RawMediaMessageInfo,
 } from '../../types/messages/media';
+import { getMediaMessageServerDBContentsFromMedia } from '../../types/messages/media';
 import type { RawUnsupportedMessageInfo } from '../../types/messages/unsupported';
 import type { NotifTexts } from '../../types/notif-types';
 import type { ThreadInfo } from '../../types/thread-types';
@@ -62,20 +62,9 @@
       | RawImagesMessageInfo,
   ): string {
     if (data.type === messageTypes.MULTIMEDIA) {
-      const mediaMessageContents: $ReadOnlyArray<MediaMessageServerDBContent> = data.media.map(
-        media => {
-          if (media.type === 'photo') {
-            return { type: 'photo', uploadID: media.id };
-          } else {
-            return {
-              type: 'video',
-              uploadID: media.id,
-              thumbnailUploadID: media.thumbnailID,
-            };
-          }
-        },
+      return JSON.stringify(
+        getMediaMessageServerDBContentsFromMedia(data.media),
       );
-      return JSON.stringify(mediaMessageContents);
     }
     const mediaIDs = data.media.map(media => parseInt(media.id, 10));
     return JSON.stringify(mediaIDs);
diff --git a/lib/types/messages/media.js b/lib/types/messages/media.js
--- a/lib/types/messages/media.js
+++ b/lib/types/messages/media.js
@@ -51,4 +51,23 @@
   return uploadIDs;
 }
 
-export { getUploadIDsFromMediaMessageServerDBContents };
+function getMediaMessageServerDBContentsFromMedia(
+  media: $ReadOnlyArray<Media>,
+): $ReadOnlyArray<MediaMessageServerDBContent> {
+  return media.map(m => {
+    if (m.type === 'photo') {
+      return { type: 'photo', uploadID: m.id };
+    } else {
+      return {
+        type: 'video',
+        uploadID: m.id,
+        thumbnailUploadID: m.thumbnailID,
+      };
+    }
+  });
+}
+
+export {
+  getUploadIDsFromMediaMessageServerDBContents,
+  getMediaMessageServerDBContentsFromMedia,
+};
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
@@ -58,6 +58,7 @@
   MediaMessageServerDBContent,
   RawMediaMessageInfo,
 } from 'lib/types/messages/media';
+import { getMediaMessageServerDBContentsFromMedia } from 'lib/types/messages/media';
 import type { RawTextMessageInfo } from 'lib/types/messages/text';
 import type { Dispatch } from 'lib/types/redux-types';
 import {
@@ -327,20 +328,9 @@
       localID !== null && localID !== undefined,
       'localID should be set',
     );
-    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,
-          };
-        }
-      },
+    const mediaMessageContents = getMediaMessageServerDBContentsFromMedia(
+      messageInfo.media,
     );
-
     try {
       const result = await this.props.sendMultimediaMessage(
         threadID,