What if you choose to save the videos and watch them in your Camera Roll? We’ll show you how, and it doesn’t require sweat.

Download YouTube Videos to the iPhone Camera Roll
Unfortunately, the iPhone apps that let you download YouTube videos directly don’t last long. Thankfully, it’s still pretty easy with a small workaround.
First, install the free app Documents by Readdle. It’s a file manager with an integrated web browser, which makes it effortless to download and transfer YouTube videos.
Next, browse to the YouTube video you desire to download. You can use the official YouTube app to do this—open the video, tap Share, then select Copy link.
Once you have the link, head back over to the Documents app. Tap the icon in the bottom-right corner to open its built-in browser. Browse to a website that can download YouTube videos, such as BitDownloader.

Saving the YouTube Video to Your iPhone
Long-press inside the Enter the video link field and select Paste to add the link to your YouTube Video. Then tap the Download button.
After a moment, the website will generate download links for your video. Scroll down (be cautious to avoid advertisements that seem to be like download buttons) until you see the Download Video with Sound header. Tap the Download button next to the quality you’d like to save.
Next, you’ll see a prompt to save the file. If you like, change the Name to something shorter or more descriptive. The default save location of Downloads is fine; tap Done to save it. You can uncheck the slider if you want to save future downloads to the same folder every time.
While you wait, tap the Downloads button on the bottom toolbar to take a look at its progress.

Moving the Video to Your Camera Roll
From here, you just need to go the video into the Camera Roll folder. Tap the Folder icon at the bottom-left nook of the app to leave the web browser and go returned to the file manager.

Next, open your Downloads folder. Press the Ellipsis icon under the file you just downloaded, then select Move. On the Move to the page, you should see a Photos folder below My Files. Tap Photos to check it, then hit the Move button at the top-right.
You’re done! Open the Photos app on your phone and you should see your new video. It will appear alongside your latest photos. You’ll also find it on the Albums tab if you scroll down to Videos below the Media Types header.
https://stacktechhow.com/how-to-download-youtube-videos-to-your-iphone-camera-roll/