media_mpx-8.x-1.x-dev/media_mpx.links.action.yml

entity.media_mpx_user.add_form:
  route_name: entity.media_mpx_user.add_form
  title: 'Add mpx user'
  appears_on:
    - entity.media_mpx_user.collection
entity.media_mpx_account.add_form:
  route_name: 'entity.media_mpx_account.add_form'
  title: 'Add mpx account'
  appears_on:
    - entity.media_mpx_account.collection