I submitted a design for a contest through the edit interface and it never showed up on the contest page. Reported it to support, every method they said to use did not work. Now they say:

"Hello,

Thank you for your information, obviously there is a bug occured, and our technical is fixing it.

And we suggest you temporary submit your design from the challenge page:"

Tomorrows Creator Bootcamp Contest is still open. Submit designs the old way through the actual contest page and hope that your design is  available.