Multilevel submenu with bootstrap 3 I am trying to make a multilevel menu using a Bootstrap theme on Drupal 8. I have created the menu and activated the "Show children" flag for all submenu containers but only first level submenus are showing.

I have tried http://knackforge.com/blog/pathirakaliappan/create-multi-level-bootstrap-menu-in-Drupal-8, but it doesn't seem to work: The submenus aren't being generated at all in the HTML. 

I am using Drupal 8.1.2 and the 8.x-3.x-dev version of Drupal Bootstrap
You should conigure the max number of menu level in block structure