Gave offline Roon ARC a good go over the weekend. Downloaded about 34GB of music onto my iPhone 11. The process of downloading was great, although it’s hard to keep the app/iphone alive while this process is happening (you’ll need to disable auto lock altogether).
There was maybe one bar of 3G service where we were. Which was coming and going.
The app worked a few times and then was continually greeted with just a black screen. If I restarted the app, nothing changed. If I restarted the whole device I could get back into the app and play an album or two before it would black screen again. Later on it stopped playing altogether (just got a white “Something went wrong” message) even when the UI was up and running.
Just logging this as a report. I expect it was something to do with the limited connectivity vs being totally offline.