Where is the file attachments field stored?

I was wondering where in the database the relationship is stored between a file and a content item, for the 'file' field type. I looked at the #__flexicontent_files, #__flexicontent_items_ext, #__content and other tables, but I just cannot find it.

I was hping to use that in another field type plugin for automatically embedding the same file that is attached to a content item.

I think you can find it in #__flexicontent_fields_items_relations (or smth similar), as that's the table where the fields content is stored.