I can listen to downloaded music on the plane or anywhere without the phone having an internet connection. When the phone has no internet connection, it has no idea if the Roon server is online or offline.
The mode switch is confusing. Unless I make a concerted effort to download my current favorites, the ARC “can’t see you core” thing is a deal breaker.
Somehow, I don’t know how, the ARC app Lost connection to the core. Rebooted everything, logged in again… all downloaded files gone!!! What sort of off-line functionality is this? I’m really growing tired of all these bugs.