Album art when browsing Albumartist.

[cabinpad]

Hi, I am new to using minimserver. Great tool with a steep learning curve. Have it up and running on my Synology with Naim as my control point. When browsing minimservers container I also have the option of browsing for "albumartist"

26 albums
241 items
3 playlists
Albumartist
Artist
Date
Genre
All Artists
Composer
[untagged]
[folder view]

Now, maybe I do not yet understand the mechanics of browsing, but when I choose to browse the albumartist option, I am presented with folder icons (no art) for all albumartists. Clicking on a folder icon for, say, Supertramp I am presented with the next level, which offers me a folder icon for the 4 albums I have. Only after clicking on this second folder icon do I finally see the artwork for the four Supertramp albums I have. (interestingly, I have other artists, when I click on the first level folder icon I see the album art for the albums in the sub folders. I haven’t figured this out either.)
This can’t be a tagging problem, as I see album art immediately I click on the option [folder view].
My question: why do I not see artwork immediately when first browsing the option albumartist instead of having to drill down through further folders before artwork appears?
Thanks for all any any help!