Note: If you're listening to the <code>NEW_FILE_DESCRIPTOR</code> and <code>UPDATE_FILE_DESCRIPTOR</code>
  events, just because the Manager dispatches a <code>NEW_FILE_DESCRIPTOR</code> does not mean that the 
  file is ready for download. On the contrary, the <code>NEW_FILE_DESCRIPTOR</code> is emitted when the 
  file is ready to begin uploading, not after it's uploaded. Instead, listen to <code>UPDATE_FILE_DESCRIPTOR</code>, 
  and check to see when the <code class="property">uploadProgress</code> prope