I created a lot of product metafields recently using GraphQL.
Unfortunately I did not define them before creating each product metafield, so they are not easily accessible in the admin interface.
So I'd like to define them so they show up when I click on a product to edit it.
If I go to the 'Custom Data' tab in the admin settings, and click 'Product metafield definitions', then click the 'Metafields without a definition' tab, I can see all of these metafields without definitions and the number of references.
If I click 'Add Definition' next to one of these properties, it appears I can define them, but when I try to 'Select type', all of the types I need are greyed out.
It won't let me pick 'File', despite the fact that every metafield with the same key is a file reference.