I dont now if it is a bug or not, but sometimes when i set an image as artist cover, it does not save:
Add the image:

change the type:

Save or restart the mp3tag, it stays at front cover:

I dont now if it is a bug or not, but sometimes when i set an image as artist cover, it does not save:
Add the image:

change the type:

Save or restart the mp3tag, it stays at front cover:

What kind of file does show this behaviour?
AFAIK not all file types support all cover types but only one like front.
see e.g. here:
This file

i use an web source to put the artist in mp3: Audible.com#Authors images.src (2.5 KB)
i save it as front cover first and then change it manually to artist.
is that an mp4 file? then the cover type can only be set to front or back
ha it is, thank you.