Hi,
i dont know if the app uses the Library/Store or Reading API. I only create folios with indesign cc 2014 and the digital publishing suite professionell, build the app with the adobe app builder and load the folio.
only use the folio overlay functions from indesign, not another code or something. i dont have experience in app programming and the last apps i builded with dps were accepted from apple.
but its the first app for ipad and iphone... i work with liquid layout for ipad, android and iphone layouts. can be a connection between iphone functionality and rejection? there are also no extra code or something in there.
greetings, andrea