Use YouTube Premium’s offline download feature in the YouTube app
Open the YouTube app on your mobile device
Sign in to your account
Open the video you want to download
Tap the Download button below the video
Choose the download quality if prompted
Wait for the download to finish
Find the video in the Library or Downloads section of the app
If you do not see a Download button, the video may not be available for offline viewing
Use only official or authorized methods to download videos