                 <code>
                                <em>destination</em>
                                </code>
                              </td>
                              <td>
                                <div>
                                  <p>A block called with the temporary location of the file on disk. The block must either move
the file or open it for reading, otherwise the file gets deleted after the block returns.
The block should return the new path of the file.</p>
              