Help – Offline Files & Web Browser Review

My friend told me about this app the other day and how to download music from it. But whenever I open a video on YouTube the pop up never comes up and it always tells me that I can’t download from YouTube for copyright reasons if I try to copy the URL in downloads, but he showed me today that if he taps on a video it asks if he wants to download it automatically. I don’t know what I’m doing wrong but it’s really annoying and I just want to know what I’m doing wrong.
Review by KIMMY CHONG ONE on Offline Files & Web Browser.