title: Is there any api for "chunk_download" for dropbox like upload
body: <p>By the word "chunk_download", i mean, is there any robust api for downloading files from dropbox.
  The api(python) i used is </p>
  
  <pre><code>for media in dbx.files_list_folder("/"+ directory).entries:
      dbx.files_download_to_file(path_local_machine, path_dropbox)
  </code></pre>
  
  <ul>
  <li>but the above api is not robust and may fail in case of network
  timeout situations.</li>
  <li>Is there any way to find the progress of download?</li>
  <li>how to handle the exception in case of network error and how to continue the download again?</li>
  </ul>