from my understanding plexamp supports cast and iphones obviously support airplay, i couldnt figure out any other way to ‘send’ music but can you run your own chromecast receiver on pi?
For Raspberry Pi and Tidal I use Volumio on the Pi and Bubble UPNP to send Tidal to it (it can also do the same with your plex library). The full version costs a couple of quid but works nicely to send a whole variety of stuff to a whole variety of other stuff.
what phone? i do plexamp->airplay on pi4->usb amp
from my understanding plexamp supports cast and iphones obviously support airplay, i couldnt figure out any other way to ‘send’ music but can you run your own chromecast receiver on pi?