diff --git a/doc/changelog.md b/doc/changelog.md
index 8230bce3..6cac16cb 100644
--- a/doc/changelog.md
+++ b/doc/changelog.md
@@ -11,6 +11,7 @@ This release focuses on fixing some important bugs that have been reported in th
     * Added notification when a user joins an instance. This notification is only available for administrators.
     * Added option to disable Streaming in the account options. This can be useful if TWBlue, for some reason, repeatedly calls the instance API.
     * Improved the code that works with the Streaming API to reduce the number of reconnection attempts TWBlue performs.
+    * Fixed media uploads for audio, video and gifvs. ([#513](https://github.com/MCV-Software/TWBlue/issues/513))
 
 ## Changes in version 2023.2.3
 
diff --git a/src/sessions/mastodon/session.py b/src/sessions/mastodon/session.py
index 67264627..ee3a7eea 100644
--- a/src/sessions/mastodon/session.py
+++ b/src/sessions/mastodon/session.py
@@ -210,7 +210,7 @@ class Session(base.baseSession):
                     poll = self.api.make_poll(options=obj["attachments"][0]["options"], expires_in=obj["attachments"][0]["expires_in"], multiple=obj["attachments"][0]["multiple"], hide_totals=obj["attachments"][0]["hide_totals"])
                 else:
                     for i in obj["attachments"]:
-                        img = self.api_call("media_post", media_file=i["file"], description=i["description"])
+                        img = self.api_call("media_post", media_file=i["file"], description=i["description"], synchronous=True)
                         media_ids.append(img.id)
                 item = self.api_call(call_name="status_post", status=text, _sound="tweet_send.ogg", in_reply_to_id=in_reply_to_id, media_ids=media_ids, visibility=visibility, poll=poll, sensitive=obj["sensitive"], spoiler_text=obj["spoiler_text"])
                 if item != None: