I'm just trying to upload some updated versions of one of my challenge entries, but it keeps failing near the end of the upload with 'There was a problem processing the uploaded file. - 200'. I've tried in chrome and firefox. The file is a zip file, 53 megs.

Also worth mentioning there are also 4 files there already, I was going to wait until successfully uploaded before deleting the old versions .. in case there is a limit on the number of files or something.