code: def _upload(param_dict, timeout, data):
      
      param_dict['format'] = 'json'
      param_dict['wait'] = 'true'
      param_dict['bucket'] = 'audio_summary'
      result = util.callm('track/upload', param_dict, POST = True, socket_timeout = 300,  data = data)
      return _track_from_response(result, timeout)
docs: Calls upload either with a local audio file,
      or a url. Returns a track object.