Cover Art - WiiM mini

[Trailscout]

In my network, I run two WiiM streamers (Pro and Mini). Streaming from music services and servers works without any issues.

However, when I play music from my local server (a USB stick connected to a FRITZ!Box), the album artwork is displayed correctly on the WiiM Pro but not on the WiiM Mini.
The artwork files are stored in each folder as folder.jpg.

What could be causing the Mini not to display the album artwork?

 

[Aquaman]

In my network, I run two WiiM streamers (Pro and Mini). Streaming from music services and servers works without any issues.

However, when I play music from my local server (a USB stick connected to a FRITZ!Box), the album artwork is displayed correctly on the WiiM Pro but not on the WiiM Mini.
The artwork files are stored in each folder as folder.jpg.

What could be causing the Mini not to display the album artwork?

Have you ever tried another server? The Fritzbox is certainly at the lowest end of computing power for a server task.
The same probably applies to the Mini. So it might be a case of accumulation of adverse conditions.