Question: how to download a video from youtube on iphone x?
Answer: Step 1Download and install Syncios Video Downloader on your computer, open it. ... 
Step 2 Go to YouTube to open the video(s) you want to download, then click on Share button under the YouTube video then copy the URL on the tab. ... 
Step 3Back to Syncios YouTube Downloader. ... 
Step 4Click on Start Download.