I teach architectural history at a local university, and use .ppt presentations for my lectures. File sizes range from 20 MB to 45 MB. I store all of my files in Dropbox, since I am constantly switching between my MBP and the university's PCs in various classrooms and need to be able to save edited versions back to Dropbox. I have an iPad, and would love to use it for reviewing .ppt presentations before class (i.e, not to edit, just view). The problem is that, at about 20 MB or so, which is generally about half the file, images don't load anymore. The .ppt slides (and usually text) load, but about halfway through, no images. I've inquired on Apple Discussions, but no solution. Is there a maximum file size that I'm bumping up against? Solutions which involve me having to download onto the iPad via iTunes are not satisfactory, as that version of the file isn't stored in Dropbox, and won't have subsequent edits. Any thoughts?