Reddit (via pay.reddit.com) does not redirect double subdomains such as www.np.reddit.com
The double subdomain www.np.reddit.com is sometimes linked to in meta-subreddits. Such subdomains are not properly matched in the redirect regex so they aren't redirected to pay.reddit.com as they should be.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information