def upload(self, file: Union[str, BinaryIO], callback: Callable = None) -> None:
        """upload the file or file obj at the given path to this key"""
        _upload = self.bucket._boto_s3.meta.client.upload_fileobj
        if isinstance(file, str):
            if not os.path.isfile(file):
                raise Exception("file does not exist!")
            with open(file, "rb") as data:
                _upload(data, self.bucket.name, self.name, Callback=callback)
        elif isinstance(file, io.IOBase):
            _upload(file, self.bucket.name, self.name, Callback=callback)