I think these will be helpful.
Ability to restrict individual file upload size / type. E.g. If uploading a picture, I can only select picture file types and/or no more than 5 MB.
Restrict a user’s total upload allowance. E.g. A user can only upload 50 MB of files in total.
PRO allows you to use 10 GB of file storage. So say a user uploads a 500 MB movie for whatever reasons, it will be hard to control that kind of thing.