function uploadFiles() {

  var files = getFilesFromGalery();
  var formData = new FormData()
  formData.append('count', files.length);
  files.forEach(
    function(file, i) {
      console.log(file);
      formData.append('image[' + i + ']', file);
    }
  );
  console.log(formData.getAll('image[]'));
  var xhr = new XMLHttpRequest()
  xhr.open('POST', '/upload_multipart', true)
  xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest')
  xhr.upload.addEventListener("progress", function(e) {
    updateProgress(i, (e.loaded * 100.0 / e.total) || 100)
  })
  xhr.addEventListener('readystatechange', function(e) {
    if (xhr.readyState == 4 && xhr.status == 200) {
      updateProgress(i, 100)
    }
    else if (xhr.readyState == 4 && xhr.status != 200) {
      // Error
    }
  })
  xhr.send(formData);
  xhr.onreadystatechange = function() {
    if (xhr.readyState != 4) return;
    alert(xhr.responseText);
  }
}