Return a list of file urls - will return a single item if settings.USE_BUNDLES is True

def get_file_urls(self):
        """
        Return a list of file urls - will return a single item if settings.USE_BUNDLES is True
        """
        if self.use_bundle:
            return [self.get_url()]
        return [bundle_file.file_url for bundle_file in self.files]