Custom attribute, add upload to fileset?

Hi there,

I’ve made a custom attribute for a thumbnail image. I would like to add the uploaded images to a fileset called ‘hero thumbnails’ for easy organization and rescanning if I updated the thumbnail settings so only the images used are being updated. I’ve scrolled trough the dashboard but I can’t figure it how to do it. I remember from Concrete5 version 6 is was possible. Is this still the case?

Use the Advanced search to filter by added to page:

Then select a couple images and edit the properties needed.