def markDownloaded(self, media):
url = '<STR_LIT>' % (self.clientIdentifier, media.ratingKey)<EOL>media._server.query(url, method=requests.put)<EOL>
Mark the file as downloaded (by the nature of Plex it will be marked as downloaded within
            any SyncItem where it presented).

            Parameters:
                media (base.Playable): the media to be marked as downloaded.