Enabling file sharing with iTunes we'll allow people to load files in the /Documents folder of the Mobile app.
Enabling file sharing is easy, we just need to add this in the Phonegap build config.xml:
<gap:config-file platform="ios" parent="UIFileSharingEnabled" mode="replace">
But, we'll have to move or show this files in the Shared files option. (Show is the best choice here because they belong to any site)