I have exhausted all the possible code that was listed, none of the code seems to work for me to change album art of a song. And jaudiotagger documentation is not helpful as well.
Tag tag = audioFile.getTag();
Artwork artwork =
ArtworkFactory.createLinkedArtworkFromURL(imgDecodableString);
tag.setField(artwork)
Can you try this part of code ? We are using this from many years ;)
Don't forget first to delete previous tags if already exist ...
To delete previous you can do something like: