title: dropbox saver not working
body: <p>I want use dropbox saver button but it works just for example file in <a href="https://www.dropbox.com/developers/dropins/saver" rel="nofollow noreferrer">documents</a>
  <br>It's not working for any other direct links.(return: "This Download attempt timed out")<br>
  Is error from dropbox or ... ?
  <br>my code is:</p>
  
  <pre><code>&lt;script type="text/javascript" src="https://www.dropbox.com/static/api/2/dropins.js" id="dropboxjs" data-app-key="urz05zr6ho1rnri"&gt;&lt;/script&gt;
  
  &lt;a href="https://dl.dropboxusercontent.com/s/deroi5nwm6u7gdf/advice.png" class="dropbox-saver"&gt;&lt;/a&gt;
  
  &lt;a href="http://icons.iconarchive.com/icons/pelfusion/paper-cut-social/256/Facebook-icon.png" class="dropbox-saver"&gt;&lt;/a&gt;
  </code></pre>
  
  <p>this code can upload <code>advice.png</code>.(example in saver doc)<br>
  but can't upload <code>Facebook-icon.png</code>.(my example file)<br><br>
  <img src="https://i.stack.imgur.com/B79Kf.png" alt="enter image description here"></p>