How do I delete files using the Content > Files interface?
There are a couple of approaches; if you'd rather manage the deletion a bit more tightly, you can use the API to get a list of node (and/or other "thing") IDs that reference a particular file:

$usage = \Drupal::service('file.usage')
  -&gt;listUsage(\Drupal\file\Entity\File::load($fid));


Then you can edit the node/etc, find the offending reference (in your example it looks like that would be within a paragraph of a previous revision), and remove it.

If you just want an interface for deleting files, there's the fledgling Delete Files module. It will even degrade gracefully for deleted files that are still referenced:


  If a file you've deleted is managed by Drupal, this module replaces it with a new empty file to head off potential problems with dangling file references.