I just got a Synology 918+ and have setup Roon on it per these sites (Roon Core on Synology).
The Synology and my local computer are both connected directly to router.
On my local network, I can use Roon to access my music.
However, when I am remote and off the network, I can’t access Roon Core but I can access the Synology through Quickconnect. Not sure what I need to do to access Roon Core away from the server but it seems odd I can get onto the Synology but not into Roon library?