The issue I had was when I was going from SYD to Uluru, I tried to checkin at the business class counter, but they told me to do my luggage myself. OK, I had checked in online the night before, so I get the luggage tag, but there is no boarding pass. I tried to get a boarding pass, but the agent told me to use my phone. OK, I had a screenshot on my phone from the boarding pass. So...... the flight attendant wouldn't accept a screenshot when I boarded, said it had to be the Qantas app. I could never get the Qantas app to install. I walked down the bridgeway to get them to print out a boarding pass. Be sure to always have a printed boarding pass. I wouldn't trust the app and you could be denied boarding.