Blueprints such as image.yml

Kirby 3 Questions 🤔
1

I have a [site/blueprints/files/file.yml] blueprint.
However, the following error appears:

What’s the problem? Please help me!

스크린샷 2021-03-14 오후 2.53.13
스크린샷 2021-03-14 오후 2.53.132932×1324 168 KB

[site/blueprints/files/file.yml]

title: File

accept: 
  type: image

columns:
  - width: 1/1
    sections:
      content:
        type: fields
        fields:
          caption:
            label: Caption
            type: textarea
            size: small
            buttons: false
2

Your file has no template assigned to it.

File blueprints are assigned on upload in the Panel, if they are set in a files section or field.