If I cast audio from Spotify to my Airport Express, I can control the volume with the side buttons on the phone.
If I do this with PlexAmp, I can’t. It’s just ignored, and I have to use Control Center.
I’m hoping this is a “turn a flag on” fix…
(if there is somewhere else to submit bugs, fire over a URL)
hmm, that doesn’t make a lot of sense 
i just cast via AirPlay to a random receiver, and i see the volume control in control center and the h/w volume keys move it up and down.
anything unique/different on your end?
OK. I tried it out in a few other ways - and it looks like it’s the foreground app I’m using - Zwift Companion (I use plex to play music while I ride). Same problem with Spotify - I just never use Spotify 
Sorry about that 
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