Thanks for posting! I took a look and we’re using core WordPress functions to enqueue all CSS and JS. Specifically, we’re using the functions get_template_directory_uri() and wp_upload_dir(). I don’t see how the issue could be on our end as using those functions to enqueue assets is a fairly common and even recommended practice. You might try filing a ticket with the developer to see if they have any insight as to how you can get those functions to return the mapped domain. It’s possible that there is a setting somewhere that you’re missing.