Thank you @sveakul! It solved most of my problems. I have a large folder that contains thousands of singles (no albums in folders). Is my only option then to embed the album arts? I see no way of allocating for each .mp3 file in that single folder a separate cover.jpg file.
It could be done with Album Artwork Retrieval Filter. The image below is a shot of that interface. To handle the files in the folder with separate non-embedded artwork for each file, you could:
1. Move <filename>.* to second on the list and check its box.
2. On the folder to be scanned list keep "Folder the music file is located in" on top and check "include subfolders."
3. Make sure all the separate image files to be used are named
using the same name as the music file they apply to, and place them in a subfolder of the folder holding the music where non-embedded images are to be used; you could put them in the same folder as those music files if you prefer.
4. Finally, hit the "Rescan Artwork" button on the bottom left of the panel.
5. Give the operation some time to complete, then Save and restart MusicBee.
![](https://i.imgur.com/uYuU3Lb.png)