Album cover doesnt show in an mp3

Hello everyone!

I'm new to this app, and I was trying to edit the tags of a song. When I was done, everything was properly saved, including the cover, or so did the app said. But when I tried to listen to the song in my mp3, the cover wasnt showing, but the other cathegories were there. What did I do wrong??

Thanks in advance

What could

be?
There are numerous threads in this forum that deal with unwilling players, use the search words "cover show" and see which advice has been given there.
E.g.