+ // If referencing an existing file, only allow if there are existing
+ // references. This prevents unmanaged files from being deleted if
+ // this item were to be deleted. When files that are no longer in use
+ // are automatically marked as temporary (now disabled by default),
+ // it is not safe to reference a permanent file without usage. Adding
+ // a usage and then later on removing it again would delete the file,
+ // but it is unknown if and where it is currently referenced. However,
+ // when files are not marked temporary (and then removed)
+ // automatically, it is safe to add and remove usages, as it would
+ // simply return to the current state.
+ // @see https://www.drupal.org/node/2891902
+ if ($file->isPermanent() && \Drupal::config('file.settings')->get('make_unused_managed_files_temporary')) {