Why Audirvāna doesn't include my UPnP network device in the audio devices?

First, make sure that your Mac and your network drive are connected to the same local network, with no router in between.

Then check that no other UPnP applications are running on your Mac when you launch Audirvāna Studio. Only one application at a time can open the SSDP port (UDP 1900) to detect UPnP devices.