I am placing all of my class content into an iBook creates with iBook author. One tool I use is dropittome. This allows me to send a file via an upload form to my gDrive or Dropbox account. I can add this feature to an iBook via a Hype created iFrame embed of the dropittome website. This gives me another way to have students upload files to me from our class iPads. So if they are working with a Tickle assignment. The students can take a screenshot of their work. Then in their iBook they can open the dropitome widget and send the file to my dropbox.
The video below shows this in action.