when using Volumio on a Raspberry Pi 4 with my DLNA Server (MinimServer) - I don’t see all covers (almost no covers from classical music, but many covers from non classical music).
My music library is completely tagged, so far I had no issues when using Auralic, BubbleDS,
Hi-Fi Cast (Android Player) or 8Player Pro (iOS).
When playing the Tracks the Covers are displayed!
I’ve seen some posts on this topic but no solution 
Is there a solution, what can be the reason?
Besides:
when using a samba share, the covers are visible, but I had to extract the cover pictures from the audio files and store them in the album folder (which is not necessary for my other dlna clients)
But in fact I prefer connecting to my DLNA Server.
Any solution for the cover issue?
Frank