I've installed GrapheneOS on a Pixel 9 Pro XL.
I've copied music to a folder and installed PowerAmp (Music player)
I've installed Sonos app and added my system to the Wifi network.
All on the same profile.
Wifi is active (Sonos works via Wifi)
PowerAmp is great I can bluetooth headphones or play off the device. All good.
I set up Sonos App. Added all my speakers to the network. All visible and was a mirror image of my iPhone set up.
Now on my iPhone I can pull up a page that shows a widget and I can click and it gives me a list of devices to play the music to.
I can't do that ...or at least can't see how to select an output in Graphene.
I can see outputs and have allowed them all but still can't play from PowerAmp to Sonos set up.
I have allowed nearby devices and network.
Any ideas as to what I might be doing wrong?