To play YouTube videos in the background while doing other things on your iPhone, you can use YouTube premium or Safari's desktop view mode.
How-To Geek on MSN

How to Loop a Video on iPhone

To watch any video in a loop, make sure your iPhone is compatible with and updated to iOS 26. Open your Photos app and tap on any video you want to watch in a loop. You will notice that the video ...
YouTube has a cache you can clear to reclaim storage space and speed up your viewing on the mobile app.