Dashboard -> Appearance -> Editor -> 3-dots menu -> Export lets one download a zip file, which contains the folders parts and templates that - according to various online tutorials - should contain the customizations done with the (Block) Editor.
However, when I move these folders to my twentytwentytwo-child theme and upload it to a new WP instance, the customizations (like for example a Navigation block or a heading I inserted) are missing.
What am I doing wrong?
