Files section / field: multiple parents

The CMS Questions
3

EDIT: had a mistake in my query

Thanks for the suggestions. Multiple file sections is the workaround I have right now. But I don’t see how I can combine queries in a files field. I tried

  fields:
    image:
      label: Image
      type: files
      query: page.images.add(site.find("images").images)

(And also extend instead of add)

Note: there is an images folder at site level. Both page.images and site.find("images").images queries work fine, but I don’t see how I can combine the results.