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[simoncn]

The Onkyo contains a UPnP control app which looks for UPnP media servers and shows a list of media servers that it has found on your network. HiFi Cast and Synology Audio Station are alternative UPnP control apps.

All UPnP control apps should work with all UPnP media servers but software bugs mean that some combinations have problems. In your setup, the following combinations work correctly to browse and play music and show artwork:

Onkyo with Synology media server
HiFi Cast with Synology media server
HiFi Cast with MinimServer
Synology Audio Station with Synology media server
Synology Audio Station with MinimServer

The combination of Onkyo with MinimServer doesn't work correctly with artwork images because of a fault in the Onkyo software. It isn't possible for MinimServer to work around this Onkyo fault.