The same hing happens when I use televzp.

So are you no longer able to to directly download YouTube videos into iPhone without downloading to  a windows or MacBook computer first?

I cannot see in Televzr how to carry out this procedure just using my iPhone 

when you click on a download option ie “mp4 420” it goes straight to AppStore as seen in attached screenshot.

When just clicking on “mp4 720” nothing really happens (see first screenshot) and I check download folder of Documents6 but see no new downloads

Various adverts appear when you first open safefrom website (see screenshot below)