Please upload here your presentations, either in .ppt or .pdf
If it is bigger than 5MB, split it in two or thre parts. You can also try to cut some images and paste them again in .jpg ---> this wil strongly reduce the size. If you embedded videos in the presentations, then replace them with their address on youtube or others internet sources.
If you do not manage to make the smaller, then send them via email AND upload a screenshot OR make a textual post here of your email, including the sender and the date