I have lots of albums without artwork. Using the (new) WUI, and selecting albums, it provides a row of album covers (mine mostly coloured squares) . If I select the 3 dots below the picture, I can go to Musicbrainz or Amazon and find one it, it then displays the CD with the artwork below the list of covers, but does not update the original picture. If I select any other function, artist for instance, and then go back to albums, the picture has been updated.
Trivial I know, but it can be a little unnerving till you realize it has actually added the artwork to the CD file, but just not updated the WUI list.
Cheers Alan