Upon attempting to upload a new changeset, I received an error on iD. I don’t know what it means but it has an error code of 400 so it should be a server issue. Does anyone know what to do here? Will I have to start over?

I tried looking through the Help page but it’s hard to find what I’m looking for.

Sumatra is currently underwater. I haven’t been here in a while and I don’t know where the opening is.