Get a placeholder that returns album's title

Hello everyone,

In my files.yml, i’m trying to add a placeholder that returns album’s name. I tried many things but I don’t get it.
Here is my code actualy

title: Files

accept:
  extension: jpeg, png, mp4
  maxsize: 100000000
  
columns:
  - width: 1/2
    sections:
      content:
        type: fields
        fields:
          headline:
            label: 
              fr: Titre de l'image
              en: Title of the image
            type: text
            placeholder: "{{ album.title}}"
            help: 
              fr: Laisser ce champ vide pour utiliser le même titre que l'album.
              en: Leave empty to use the same title as the album
  - width: 1/2
    sections:
      meta:
        type: fields
        fields:
          alt:
            label: Alternative Text
            type: text
          credit:
            label: Credits
            type: text
            width: 2/3
          link:
            label: Link
            type: url

I guess I just don’t use {{ album.title }} in the good way but I don’t find anything about it in the forum.
Anyone have advices?

Try file.parent.title, you don’t have access to something called album.

Oh, it works ! It looks totaly obvious now.
Many thanks !