title: Restrict file type for a upload, ie only to show mp3
body: <p>Is it possible to restrict the file upload for an form input to be only show files with the extension of mp3, like this:</p>
  
  <pre><code>&lt;input class="someClass" type="file" name="UploadAudio" accept="audio/mp3"/&gt;
  </code></pre>
  
  <p>Because for some reason this does not work, it always seems to show other file type extensions for upload. </p>