If you’re watching a YouTube video on your Android phone and pause it then move to another app, you may start seeing a new notification. It will offer you the option to resume playback, not on your phone but on your TV. Obviously you need to have a Chromecast-connected TV or an Android TV on the same network for this to work.
The notification popped up for me yesterday while I was in bed catching up on the Champions League goals, but I dismissed it since I was away from the NVIDIA SHIELD in my living room.
YouTube notification offers to resume a paused video on your Chromecast-connected TV was written by the awesome team at Android Police.