get https://yoursubdomain.workbright.com/api/submissions//attachments/
A note on the success of this endpoint: If any file is given, it will return a 302 redirect regardless of the accuracy of the file path. If the file provided to this endpoint via the path is invalid, then following the URL that is returned from this endpoint will lead to a 400 bad request. However if the filename is valid, then following the URL will return the file.