In Demo project, I am able to add annotate on some document on emulator, But in ipad, ipadmini, iPhone It do not let me add any annot on any document. I changed the device and pdf document but did not get right thing.
In coding terms:
On Emulator --- [m_doc canSave] returns 1 or true
On device --- [m_doc canSave] returns 0 or false // Tested on 3 devices with 4 pdf documents