Crabgrass adds spaces in urls
e.g. posted comment with this url:
site.com/foo/09xcvbnbl3345fdg848af487vcbc43e0b792f6ebe97dfe91
got this one:
site.com/foo/09xcvbnbl3345fdg848af487vcbc43 e0b792f6ebe97dfe91
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information