bt_media.links.menu.yml

bt_media.website_media_menu:
  title: 'Media'
  description: 'List of all multimedia assets'
  parent: bt_cms.website_menu
  route_name: entity.media.collection
  weight: 2
  menu_name: bt-menu-app

bt_media.website_media_add_menu:
  title: 'Add media'
  description: 'Add media element'
  parent: bt_media.website_media_menu
  route_name: entity.media.add_page
  weight: 0
  menu_name: bt-menu-app