I'm trying to create a custom `file-link.html.twig` for a particular content type. I've looked at https://www.drupal.org/node/2354645 which doesn't link plugin theme twigs like file-link but tried `file-link--<CONTENTYPE>.html.twig` anyway. It doesn't work. 

None of the variables passed include the node or content type. Any ideas on how to proceed?