def METHOD_NAME(self, draft, draft_file_service, uow):
    """Upload files to draft."""
    # Validate the release files are fetchable
    self.test_zipball()
    draft_file_service.init_files(
        self.user_identity,
        draft.id,
        data=[{"key": self.release_file_name}],
        uow=uow,
    )
    with self.fetch_zipball_file() as file_stream:
        draft_file_service.set_file_content(
            self.user_identity,
            draft.id,
            self.release_file_name,
            file_stream,
            uow=uow,
        )