Use the YouTube app’s offline download feature if you have YouTube Premium
Open the video in the YouTube app
Tap Download below the video
Choose the video quality if prompted
Wait for the download to finish
Find downloaded videos in Library or Downloads in the YouTube app
Use the YouTube app’s offline viewing only for supported content
If the download option is unavailable, the video may not support offline saving
Avoid third-party download sites or apps that may violate YouTube’s terms or contain malware