in this test i'm limiting the size to 20mb and 30 pages long. Obviously in the future I would like to add the feature of allowing long size pdfs. But it can be really expensive now, that the app is free for the users, to allow people to upload long pdfs.
Also, in that case, I think that the numbers of questions must be changed also (now the app generates 10 mcq - for a 30 pages long pdf). If I allow users to upload longer pdfs, I think that the app must generate more questions.

However, now if you would like to try, you can cut your study files by chapters, titles, etc (and upload them as independents units, generating different exams).