def set(self, media, _bytes, overwrite=True, b64encode=False):
        """Set *media* from *_bytes*. *overwrite* parameter specify if the media
        must be overwrite if it exists remotely.
        """
        data = base64.b64encode(_bytes) if b64encode else Binary(_bytes)
        self._dokuwiki.send('wiki.putAttachment', media, data, ow=overwrite)