Thought this might be of interest
Having tried (mostly unsuccessfuly)a lot of methods of streaming to my stereo from my cloud and controlling it through my Android I have found succes at last
The biggest problem was creating playlists.
Attached a Chromecast to the input on the stereo, installed an old version of Plex on Android (latest version created problems) and put the music into the Plex folder to My Cloud. I cast it the Chromecast.
This has enabled me to create playlists and obviate the awful My Cloud app.