Since iOS 13, Shortcuts has become a stock app on iPhone or iPad for automation.
You can download any YouTube video to MP3/MP4 including private YouTube videos. The good thing is that you don’t need to download third-party apps unless you intend to. Here, I will show you 5 different ways to do it. To listen to music offline on the go, I decided to download YouTube to MP3 on iPhone. I love listening to music on YouTube because it always recommends tracks that I love.