Shouldn’t you be using a field with type filepicker
instead of file
?
- File
in Admin, File is specialized to be used in plugin and theme configurations (blueprints). Handles uploading a file to a location and deleting it, and removing it from the theme / plugin configuration| - Filepicker
Filepicker allows to choose files from a location in the web server filesystem.|
I use the following to set the frontmatter in my page:
header.theme.headerImage:
type: filepicker
folder: 'theme@:/images/headers'
label: Select an image as header
preview_images: true
accept:
- .png
- .jpg