Add file usage for thumbnails?

[laryn]

In trying to track down this issue, I found some of the culprit files-with-no-usage were generated by this module. Does it make sense to add a usage when a thumbnail is generated here?

On one of the dev sites I'm working on, we're using the Video Embed Field module, which creates a thumbnail image from a Youtube or Vimeo video -- these thumbnails don't have any usages added in the Manage Files area. They show up in the Image Library, however, and give the error above ["The file used in the Image field may not be referenced"].