Ok now it has happened to my account. Bittrex asked for basic verification and then suggested that I go under the enhanced verification process. Happily I did to get it done. Then like some of you, I'm having the same problem. Something went wrong with processing of documents and the site told me to submit them again, but with no way to resubmit them.
I already emailed support. I expect its going to be long wait but I will post any progress in my experience so if it happens again to someone else, this thread will hopefully be helpful to them.
I opened a support ticket with Bittrex. They transitioned my account to Enhanced within 48 hours. Just check your account "Summary Tab" 48 hours after you open a support ticket. Make sure you upload the files with the ticket to reduce follow-up. You Should be good.
https://support.bittrex.com/Thats a good idea, but sadly I missed that opportunity.
But the good news is Bittrex replied within 24 hours and has asked me to try again. I dont think they know the situation about the resubmit option not being available.
What I did was I told them I did everything I could and I have requested for a manual verification process. It could take another 24 hours or more for them to reply.