jon parker
Headphoneus Supremus
In my experience album jpeg's in album folders can have any name you choose; renaming to album.jpg is not necessary.....
Sorry, renaming to folder.jpg is not necessary....
Respectfully, the only 100% working thing [that I have found] is to name the jpeg 'cover' On some devices the artwork named 'folder' wont show up !!
(but of course, if it works for you then do 'it' whatever the 'it' may be!)