I went through the same process so I will tell you what NVC requires from you and you need to upload on the CEAC portal which are 3 things:
(1) Your original signed Nikah Nama urdu version all pages.
(2) Your original signed Nikah Nama urdu version translated into english (also get the translated version notarized after then upload it.)
(3) Your NADRA-issued marriage registration certificate which is half urdu half english.
You can find all this information on travel.state.gov
I will try to upload a picture of it too If this forum allows it