Useless and scary

Tried to check in to an international flight. It kept asking me to scan my passport, which I did. It then showed the correct information, which I submitted. Then it said it had to verify it. After 5 minutes (!), it was asking me to scan my passport again. So I continued without passport, meaning I have to go through full check-in at the airport to get a boarding pass. I paid through the app for my luggage. But I got no confirmation email. I wasn’t even sure I was checked in and had to call United. This app is almost useless. United’s people need to do some serious work to make this app at all useful.

using-a-useless-app about United Airlines