I’ll bet that this question has been asked before. Can Roon Core, running on an iMac, ‘see’ an Aurender streamer as a source of music files?
Aurender shares its internal drive with SMB… this network share could theoretically be added to the Roon core just like any other network drive.
Even if you can see the files inside it, you cannot stream to it via RAAT. Only via AirPlay.