code: def save_file_as(self, file_url, new_file_name, destination_folder=None):
          
          if not destination_folder:
              destination_folder = constants.Files.DOWNLOADS_FOLDER
          page_utils._download_file_to(
              file_url, destination_folder, new_file_name)
docs: Similar to self.download_file(), except that you get to rename the
              file being downloaded to whatever you want.