Query related to Lesson Type Theory

Hi, We have Lesson Type as "Theory" and when we create a Question for the same we get Question Type as "Slide" When a "Slide" Question is created it provides option only for PDF and size restriction of 2 MB. Have a 2 Queries - Any other files e.g. Video (MP4), PPT, etc. can be attached? How? Can we increase the file size? Thanks in advance, Narendra Purohit