If the school requires a separate evaluation sheet, you have to tell your professor to fill it out and email you. You can upload the form to Interfolio and they will send the letter with the form together. I got rejected from Ph.D programs, but I don't think it was because of incomplete application. ( None of the schools actually explained specifically why I got rejected. They always send out generic rejection letter. >_< Plus, Interfolio will charge extra when you want to ask them to expedite the service. I remember they charge every transaction. ( if you have to send out 17 letter, it will cost a lot. )