I'm F3 too DQ in Oct 2020. I have just one concern as you mentioned that "Although we had all the required documents with us, apparently we were also supposed to upload the more recent tax documents and police certificates to the CEAC. Since they weren’t on the CEAC, we were issued a 221(g)." is it mandatory to upload again new tax documents and PCC after DQ and all document were already approved and accepted or you may do it after issuance of IL prior interview??. Are they accepting new tax and PPC document at the time of interview to avoid 221(g).