Hello I'm Nik/Unsplash
YouTube adds a new feature that makes it easy to switch from watching on your smartphone to your PC. If you're watching on the YouTube app on Android or iOS and exit before it finishes, a mini-player with the same clip will open in the bottom corner when you launch YouTube on the web. Instead of showing the channel name at the bottom, "Continue watching" is displayed beneath the title. The feature is rolling out to users. If it hasn't made its way to you, you might just have to wait a bit.
Source: Engadget