如何通过dropzone调用AJAX请求？

Question

我正在尝试通过dropzone发出一个AJAX请求，但它一直给我一个错误No URL provided.这个AJAX请求在我的输入字段中工作但是当我尝试将它插入我的dropzone时它没有工作

<div class="dropzone" id ="drop">
  <div class="fallback">
    <input type="file" id="files" name="files[]" multiple></input>
  </div>
</div>

function handleFileSelect(evt) {
  var files = evt.target.files; // FileList object

  // files is a FileList of File objects
  for (var i = 0, file_name; file_name = files[i]; i++) {
    $.ajax({
      url: 'https://content.dropboxapi.com/2/files/upload',
      type: 'post',
      data: file_name,
      processData: false,
      contentType: 'application/octet-stream',
      headers: {
        "Authorization": "Bearer ACCESS TOKEN",
        "Dropbox-API-Arg": '{"path": "/' + file_name.name + '","mode": "add"}'
      },
      success: function (data) {
        alert('Success Upload');
        console.log(data);
      },
      error: function (data) {
        console.log(data);
      }
    })
  }
}

document.getElementById('files').addEventListener('change', handleFileSelect, false);

如何调用AJAX请求？