How to use the cloudinary.v2.PreloadedFile function in cloudinary

function create_direct(req, res) {
  // In direct mode, the image is uploaded to Cloudinary by the browser,
  // and upload metadata is available in JavaScript (see add_direct.ejs).
  var result = {};
  var photo = new Photo(req.body);
  result.photo = photo;
  // image was not uploaded, returning to edit form
  if (!req.body.image_id) {
    if (req.body.type === 'direct') {
      res.redirect('/photos/add_direct');
    } else {
      res.redirect('/photos/add_direct_unsigned');
    }
    return;
  }
  var image = new cloudinary.PreloadedFile(req.body.image_id);
  // check that image resolved from image_id is valid
  if (image.is_valid()) {
    photo.image = image.toJSON();
    console.dir(photo.image);
  }
  photo.save().then(function () {
    console.log('** photo saved');
  })
    .catch(function (err) {
      result.error = err;
      console.log('** error while uploading file');
      console.dir(err);
    }).finally(function () {
      res.render('photos/create_direct', { photo: photo, upload: photo.image });
    });
}