This was working two weeks ago.
I just start using the same file I was using before and when I try to preview in folio builder with the content viewer on with my iPad connect. I get the following comment:
To preview on a connected device, the Adobe Viewer app must be open on your device, this is on the mouse over.
When I click the preview button I only see, preview on the desktop. I have the iPad connected, I can see it in iTunes and iPhoto.