I had this just over a year ago with my Mt.Hood route. Supposedly within the file size limit, config and thumbnail image present and correct but neither CMP or the FTP system would upload it. Helpdesk couldn't help, definitely one for the "too hard" basket. So it ended up on the Trainsim.com file library instead.
Yeah 55mb, I thought it was well in the limit
Looks like they gotta look at what's going on
Uploaded the the route to a file share site for a Beta test and not a problem
Got no Idea what 's going on