What if you want to save YouTube videos and watch them in your iPhone's Camera Roll? We'll show you how, and it doesn't require jailbreaking or anything else shady. But this still requires you to watch the videos in the YouTube app.
If you don't mind paying, you can subscribe to YouTube Premium to watch without ads and download videos for offline viewing.
But watching YouTube offline is tricky business. Because YouTube uses so much data, saving YouTube videos to your iPhone is a good idea.