It clearly shows artist logo.jpg files that i put in a root folder of an artist. It shows logos that i created that could not have been downloaded. But for about half of my artists it doesn't work.
I use Poweramp mostly thru the folder hierarchy menu.
My folders are organised like this:
Musik\Artist\Albums\
Examples:
Musik\Abba\Greatest Hits
Musik\Abba\Worst Hits
Etc.
In hierarchy folder view it shows a file logo.png or logo.jpg that I put there, for about half of my artists. For the others it shows folder.jpg or cover.jpg of the first album folder, also clearly those I put there, not downloaded.
The behavior of the app apears to be inconsistent and as a person on the mild side of the autism spectrum there is nothing i hate more than inconsistencies.