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
@@ -26,3 +26,14 @@
   time: number, // millisecond timestamp
   media: $ReadOnlyArray<Media>,
 };
+
+export type MediaMessageServerDBContent =
+  | {
+      +type: 'photo',
+      +uploadID: string,
+    }
+  | {
+      +type: 'video',
+      +uploadID: string,
+      +thumbnailUploadID: string,
+    };