Since updating my iPhone, I can no longer save videos from you tube? Jan 2018

Hello! Our help will be more effective, if you copy and send us info about your browser: 
http://en.savefrom.net/user.php?info=1 
We'd also need some links you can't download (to test them). 
For the better understanding it'll be great to see a screenshot with the error. 
We are waiting for your reply, and thank you for contacting us Savefrom.net Team!