Hello Amarapuri6, Open and friends

I gotta H1B visa interview tomorrow. I am confused about visa interview appointment letter. I have seen some people talking about that in some other blog. DO we need that letter? I applied DS160 online, and i only got confirmation page and appointment date from Nabil Bank. Is visa appointment letter required document for visa interview? Please let me know. i have interview tomorrow at 8:30 AM.
Please reply me ASAP. Appreciate that.

Thank you.