       </div>
          <div id="custom_fields" class="custom-fields-content hidden">
            Properties box
          </div>
        </div>

        <!-- Custom selection for Slack -->
        <div id="add_slack_selection" class="btn btn-light form-control hidden" style="margin-bottom: 1em;">
          <span style="margin-right: 0.5em;"><img src="https://a.slack-edge.com/80588/marketing/img/meta/favicon-32.png" class="btn-icon"></span>
          <span>Select messages</span>
        </div>
  