I apologize for the crying kid in the background about 16 minutes into this video. That's the kid downstairs. I had to stop recording for a while until she stopped crying. Watch as we inspect allegedly damaged books. I talk to myself a bit as I work.
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