@psychoadept
Hello there.
On MusicBee 3.5.8150, I cannot find the filter for missing artwork.
I managed to find tools -> artwork -> downloader, but it seems to offer the ability only to download covers for a few albums - and those were albums for the currently selected artist.
I found tools -> artwork -> album artwork manager, but clicking it seems to do nothing.
All of this seems jolly confusing to me! (Still, I am grateful for the software, which in other respects works well.)