Browser not rendering .xml.gz files correctly
The content-type and encoding are set correctly in Django (application/xml and gzip), but those response headers do not seem to be making it back to the browser. Maybe there is some issue with them being passed through the Apache reverse proxy?
Can debug some with Chrome developer tools and with Apache logs.
See an example here: 
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information