I still don't have my interview appointment, but I am just wondering about my situation. I am the beneficiary in this scenario. I had with me a certified true copy of my birth certificate and I sent a photocopy of that to USCIS. When I applied for my passport, my embassy took that birth certificate. So, right now I don't have a birth certificate on hand and I don't think the embassy will return it (though I hope they will.) Now, do I really need the original one for the interview? And what problems may arise if I don't have one?