I'm currently having the exact same experience -- I sent (1) photograph, (2) copy of passport, and (3) copy of hotel booking, and was asked to provide:
(1) notarized letter of invitation,
(2) copy of the NIC (national id card) of the invitee
(3) copy of bank statements
(4) job letter
I'm guessing I'm going to have to go to the consulate in NYC to sort this out, but it'd be super helpful if anyone had advice about this.