Dropbox – synchronised file sharing across many operating systems
1) You can’t upload your files from apps like Pages, Numbers or Keynote without WebDAV, which provides a framework to change and move documents on a server. Here is a short and simple guide that shows you how to use your Dropbox account as a WebDAV: WebDAV guide
2) I had expected Dropbox to be more intuitive for students than it actually was. Very often they did not know where they were because they overlooked the back button in the upper left corner.
When they felt more comfortable with Dropbox, I uploaded instructions for some lessons so students were encouraged to learn at their own pace. I could help those who needed more explanations while others successfully completed one task after another.