Handle thumbnail urls

synapse/storage/room.py

@@ -562,10 +562,12 @@ class RoomStore(SQLBaseStore):
                     next_token = stream_ordering
                     content = json.loads(content_json)
 
-                    url = content.get("url")
+                    content_url = content.get("url")
+                    thumbnail_url = content.get("info", {}).get("thumbnail_url")
+
+                    for url in (content_url, thumbnail_url):
                         if not url:
                             continue
-
                         matches = mxc_re.match(url)
                         if matches:
                             hostname = matches.group(1)