def set_files(self, files_downloaded, files_failed):
        """ set_files: records progress from downloading files
            Args:
                files_downloaded ([str]): list of files that have been downloaded
                files_failed ([str]): list of files that failed to download
            Returns: None
        """
        self.files_downloaded = files_downloaded
        self.files_failed = files_failed
        self.__record_progress(Status.GET_FILE_DIFF)