I believe he said mail drop supports files up to 5gb so you are probably good.I have 11 gb on Dropbox and 48gb on onedrive. I only keep Dropbox around because it has a larger single file size limit. If iCloud drive has a >4gb per file size limit then goodbye Dropbox. I will probably get the 200gb deal to start with. The only other place I would store data is box.com which is what we put our clients on.