Hello.
I just replaced my 1st gen Chromecast with a Onn 4k Android TV.
Although I'm using smart tube next, I noticed that if I cast something to the built in Chromecast the remote buttons don't work. I used to be able to play and pause with the TV remote on my 1st gen.
Is this normal behaviour?
Make sure HDMI-CEC is activated in the Onn.