I am in the same situation. I had to enter all the info from 2018 manually into the TT interview process. It was pretty easy. I don't think there is any way to scan it in.
During the interview process TT will ask you what taxes you paid last year, including any prepayments for 2019, like you did when you over-payed before. Once you have gone through the entire interview process, you can go to the Forms menu (in the pull-down up top of TT screen) and look for Schedule 3. It should show on line 8 the total amount being applied from your prior payments.
I hope this helps!