I know the Plex side of Sonos seems to be mostly working at best. I see many feature requests and agree that full integration with Sonos would really push things to the top.
Right off the bat, where is this with HiRes?
I cannot play any DSD (format: DSF) files at all via Sonos through Plex (both desktop and app). Seems simple enough if it just transcodes to a lesser PCM that Sonos will take. It obviously does this already since the native Plex app plays DSD just fine to my phone.
Oddly enough, high bitrate PCM does work ONLY if I play them through the Windows Sonos desktop application. The very same songs do not work via the Android Sonos app routed through Plex, when added that way...it complains about unsupported format.
The ability to play all resolutions of PCM and DSD would make Sonos much more viable and surpass the ancient 65k song limit that many face.