One problem is that the copy service has been discontinued. This is a very big problem. I've tried Dropbox and many other file sharing programs, none of them have worked. I need a FREE file sharing service for my modpacks.
Update: SpiderOak works fine and when I used Dropbox, I updated my pack and it went to negative numbers. I wouldn't recommend Weebly because every time you need to make an update you need to get rid of the file on Weebly and replace it with the update, unless you want a list of versions on that site.