Import file in iOS via 'Open In'

I have registered my app to handle db files.  I want to have the capability to import and export a SQL database.  The export works ok and I can use open in to launch my app and I can see the content path (ex. file://...).  If I try to do a copyToAsync it errors out and I think it is because of the sandboxing on iOS.  How do I copy it in?  Thx