Sorry the audio isn't that great. I used the mic on my iPhone since I couldn't really lug around my 3Dio. This was made after a few requests to see my collections etc. I'm sorry if it makes you dizzy.
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app