Display all files in files section

Up to now I’ve been telling people to first upload all files in a files section (so you have an overview of all files available) and select where required.
I would rather implement: upload files anywhere and the files section updates automagically.

Example:

right:
  width: 1/3
  sections:
    fields:
      type: fields
      fields:
        cover:
          type: files
          layout: cards
          multiple: false
          size: medium
          uploads:
            template: default
          width: 1/2

    files:
      headline: Files
      type: files
      template: default

This files section updates when I upload a file to the above cover field. But when I upload an image, say in a Textarea, the file is not added to the files section. How do I get the files section to display all files?

Ok, this works. The files section updates when a template is specified for uploads.

abstract:
  label: Text
  type: textarea
  size: large
  uploads: 
    template: default

File upload and select