Image blueprint not recognized

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Hello,
I have a “files” field inside of a “structure” field. Somehow the blueprint for the image is not recognized and I always get a notice that I can add fields to the default file blueprint. The “files/image.yml” exists but is ignored. This is my code for the field:

imagePreview:
  label: Preview image
  type: files
  layout: cards
  template: image
  info: "{{ file.dimensions }}"
  image:
    ratio: 5/4
    cover: true
  multiple: false
  required: true
  size: small

Any ideas how I can fix it?

There is no template prop on a files field, the blueprint needs to be set via the uploads prop: Files | Kirby CMS