Updating APIC tag leads to empty cover art on Spotify's local files

[Shubh Patel]

Hi, I'm programming my first project using mutagen, moviepy, pytube and flask. Essentially the program converts a youtube video into an mp3 with updated metadata (such as updated song name, artist name and cover art).

The problem that I'm having is that my cover art on Spotify is not updating whereas my artist name and song name both update perfectly fine. In order to update the cover art, I'd have to manually upload the art through Apple Music or MP3Tag, or some other third party software.

Here is my code so far, it runs perfectly well but the cover art does not show up on Spotify's local files. Any help would be appreciated!

EDIT: Fixed by using eyed3