It’s not perfect, but I found a pattern to get to work. I have the 50RS 3-pack lights.
To connect you really need to do things in the same order every time. Assuming you’ve downloaded app, etc., first make sure app is closed. Turn one light on WiFi. Go to settings and connect to that light’s WiFi. Once connected open app. Switch device to RGB Light. It eventually connects every time for me, but you have to close the app and do in that order.
I found one light had a different WiFi password and I had to reset. That was tricky as I held to reset in a couple screens before apparently working.
I found the channels irrelevant. It changes that light no matter what channel I was on.
I cannot seem to control more than one light with app. I tried master slave setup but would not connect at all even with one on WiFi. I had to have all 3 lights on WiFi, then going back through those steps it always connects to just one, and not always the same one.
So it seems to work, tricky as noted, just be sure app closed, connect to light WiFi, open app, switch to
RGB Light, connects every time for me.