My album art for the music that I store on my QNAP NAS is not showing up in the Roon app. The music is there, just not the art.
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Is this happening on all remotes?