If you are getting a fast pass for something very popular like Anna and Elsa or the Mine Train I would recommend doing a screenshot. I lost my fast pass using the app and after 3 phone calls to I.T., they finally agreed to reinstate it because I was able to show that it I had it reserved. Better safe than sorry.
Reserving the FP+ was a breeze & it only took 30 minutes because I went back and tweeked the times for everything. I could have been done in less than 15 minutes, probably. Good think we weren't looking for Anna & Elsa FP+ because they were all gone at 1:00 a.m. Everything is on MDE & I printed out a copy there. I'll get the app later.
If you are getting a fast pass for something very popular like Anna and Elsa or the Mine Train I would recommend doing a screenshot. I lost my fast pass using the app and after 3 phone calls to I.T., they finally agreed to reinstate it because I was able to show that it I had it reserved. Better safe than sorry.
Also know that more often than not, Disney has refused to honor screenshots for A&E and SDMT. For almost any other attraction a screenshot has proven to be helpful. But those two most popular attractions have left guests receiving a "sorry, there's nothing we can do" from Disney when things went awry.
I was actually sad after booking the last FPs Wednesday night. Now I have 58 days and NO planning to do! I'm resisting the urge to make minor time tweaks to our existing FPs now