On the video which you had Download, right slide, click "more", Save to Album.
Use finger swipe left or right to back or forward on the screen edge.
If you need history，you can hold the YouTube tab.
Currently only support Paypal.
Use PayPal SDK, to protect the security.
You can download from TutuApp Store. http://www.tutuapp.com
Download times limit to 100/day.
Download by server if some video region's copyright restrictions
Then YouTubeDL will appear on the desktop
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