etKeys = secretsJson;

      createPicker();
    }

    /**
     * A callback function that extracts the chosen document's metadata from the
     * response object. For details on the response object, see
     * https://developers.google.com/picker/docs/results
     *
     * @param {object} data The response object.
     */
    function pickerCallback(data)
    {
      let action = data[google.picker.Response.ACTION];

      if(action != google.picker.Action.PICKED &&
        action != google.picker.Action.