editor_file-8.x-1.5/editor_file.routing.yml

editor_file.file_dialog:
  path: '/editor_file/dialog/file/{filter_format}'
  defaults:
    _form: '\Drupal\editor_file\Form\EditorFileDialog'
    _title: 'Add file'
  options:
    _theme: ajax_base_page
  requirements:
    _entity_access: 'filter_format.use'