Lumin App and Chromecast Audio

I've downloaded the Lumin app onto my Ipad to give it a go. It's successfully found my music library (Plex Media Server on my PC) but when a song is selected no music is forthcoming? I currently use chromecast audio and wonder if this is the issue. Is Lumin compatible with CCA? Unlike the Plex app and mConnect which I've tried there appears to be no way in the Lumin app to select where the music is played to i.e. Ipad or CCA speaker. I've searched the net but not found anything to confirm either way.

Any thoughts? Thanks.