I use the U1 Mini w/S-Booster... it's outstanding. So, there are settings in the Lumin app that control just about everthing including shut down. I have mine set to turn off 10mins after I close the app & system: Lumin goes into sleep mode. When I open the app again, the Lumin wakes. The storred files need to be favorited in whatever streaming app you're using. The Lumin should recognize all your Qobuz & AM favorites and playlists. Does take a while to get used to and to customize the upsampling settings but once finished, excellent product.
I much prefer both the Auralic Lighning app & BlueOS to the Lumin app though - for such an outstanding product they should up their app game. Don't mind the OM being online but the layout and overall look/feel is really very '00s.
Just my opinion...