Use YouTube Premium to download videos in the YouTube app for offline viewing
Open the YouTube app on your iPhone
Sign in to your YouTube Premium account
Open the video you want to save
Tap the Download button below the video
Choose the video quality if prompted
Wait for the download to finish
Open Library or Downloads in the YouTube app to watch offline
Keep the video available in the app while your subscription remains active
Use the Files app only for videos you already have legal permission to download
Avoid third-party download tools that may violate YouTube’s terms or copyright laws