Just did exactly this last week for the first time. I got the email within seconds of ordering, and then just scanned them in. Make sure to NAME each ticket correctly as you scan it into the app. They all defaulted to my name when I scanned them in, so I left one that way, and changed to others to the names of the others in my family. This made it easier to book FPs for the correct person in the app. It also printed each person’s name on the bottom of the physical ticket that you get at the turn style when you scan your UCT tickets the first time. I scanned the UCT tickets into the app, then showed the app tickets to the gate CM and they took my photo and gave me the paper ticket. Took no longer than a ticket bought directly from Disney (which is what I have always done in the past).