How to list ALL images under 'Files'?

Images uploaded via ‘Cover, Hero’ do not appear in the overview under ‘Files’. However, they do appear in the selection pop-up window and can be selected.
How can I ensure that ALL images assigned to a page are also listed under ‘Files’ as a thumbnail?

excerpt from the blueprint of the site:

        type: fields
        fields:
          cover:
            required: true
            type: files
            template: image
            help: required - name it 'cover'; max. 640px; portrait and square formats; .png with transparency  preferred
            multiple: false
          hero:
            required: true
            type: files
            template: image
            help: required - name it 'hero'; max. 1280px
            multiple: false
          files:
            type: files
            template: image

KIRBY 4.0.0-beta.2

You might need a files section rather than a files field?

For some background info: A files field is a select field for files, so it only shows the files that have been selected, not anything else uploaded.

As @VIPStephan already suggested, you need a files section to show all files uploaded with the given template.