LandmarkResource, and when I visit the EditLandmark page I would have the cluster navigation to access another custom Page that was created managing resource data, for example Images related to the landmark.landmarks/<id>/editlandmarks/<id>/medialandmarks/<id>/...EditLandmark page to appear in a cluster by setting the protected static ?string $cluster = ... property. Nor the Custom Resource page for managing the Media, as per the example.Page component, however maybe clusters don't work with <resource>/<id> pages.