How to create menu when dynamic routes This link https://www.drupal.org/node/2122201 suggest us to make use of route_callbacks when we are using dynamic routes.Can someone tell me how to make use of this route name in *.links.menu.yml file to make menu? The problem is when we are returning $route_collection in the routes() function then it must be containing multiple routes then how to generate menu for any particular dynamic route.
 I did a search inside menu_tree table in the database and find out that no menu has been created with help of dynamic routes so I am beginning to think whether this is possible or not. If it is not possible that what is the possible solution?
You need a derivative plugin, see views module for an example, it dynamically generates menu links for views configured to have a menu entry