Hey,
via the AirPlay plug-in or Spotify Connect Volumio web player is not showing current volume level.
For example, I change the volume on the iPhone (Spotify app -> AirPlay), and in the webplayer (volumio.local in the browser) the volume does not change and vice versa: changing volume vie web player (during AirPlay session) doesn’t work.
Is this a bug?
For spotify-connect it’s a known issue that has been fixed and is undergoing testing now - expect a release in a near future 