I created the following files blueprint at /site/blueprints/files/foto.yml
title: Foto fields: info: label: Titel type: text copy: label: Fotograf / Copyright type: text
…and added it to my blueprint:
title: Ausflugsbericht tabs: allgemein: fields: [...] fotos: preset: files template: foto
But no matter whether I open an existing image or upload a new image and open it, on the image page it always says “This page has no blueprint setup yet”.
(When I create a default.yml as suggested at https://getkirby.com/docs/reference/panel/samples/file it shows the text field fine.)