Uploading my font on Monotype Platform in TTF format will end with a page: "Forbidden.."
I try a new submission with OTF format (for tests) and all work fine.
My contact with support ends with
"We only accept files in OTF or TTF format, not both" 
Has anyone else encountered such a problem?
Comments
As for a variable version, I decided early on to sell and distribute that as a separate family with a separate name (Proxima Vara). But I know some like to include it with the static family, so I can see how that would be a problem.