Issues With e7D and RayRemote App

[robertdungan]

Chuck
I've resolved part of the issue (the seemingly random function select) and put this down to 'user error'. I can't explain the apparent refusal to stream. I've uninstalled RayRemote and installed RayView which seems to work fine except that it's view only and you can't change displays.
I would like to install RayControl. I've tried two cell phones now and neither of them show it available via the PlayStore, likely since RayMarine suggests you use it on tablets only because of the small screen size on a phone. I'm thinking you have to sideload it as described on C/NET. Is this the case?