Picture Upload in Panel doesn't work

Kirby 3
1

This is my blog panel. The panel is showing correctly. Everything is working except the Picture Upload. When I hit Upload, nothing happens.

title: Blog
icon: 📚

tabs:
  content:
    columns:
      top:
        width: 1/1
        fields:
          blog_hero_image:
            type: files
            label: Picture
            layout: cards
            size: medium
            multiple: false
            template: image
              image:
                ratio: 16/10
                cover: true
      left:
        width: 1/2
        sections:    
          drafts:
            type: pages
            extends: sections/articles
            headline: Drafts
            status: draft

          unlisted:
            type: pages
            extends: sections/articles
            headline: In Review
            status: unlisted

      right:
        width: 1/2
        sections:
          listed:
            type: pages
            extends: sections/articles
            headline: Published
            status: listed
  seotab: seo
2

What does this mean? You don’t even get a file selector?

You indentation of the image property is not correct and a files field doesn’t have a template property, see Files | Kirby CMS