I filed with the USCIS. After I received I-130 approval, I got the NVC to expedite the case. Then the case went to the embassy without the need for NVC review.
So, perhaps, after that the process is more like a direct file? After I booked an interview at the embassy online, I got an email saying I must upload AOS and some other documents onto the CEAC website. However, I haven't been able to upload any petitioner documents. I am emailing the embassy but getting canned responses so far. As in, a pdf showing the instructions for uploading. It is possible that the AOS is just reviewed at the appointment, but the embassy hasn't indicated this. Very confusing!