After selecting a store and clicking on the Show button, it will display a list of all files that exist under the store folder but they have not been linked according to the database.

After selecting a store and clicking on the Show button, it will display a list of all files that, according to the database, are linked but the physical file does not exist in the store.

Clicking on the Show button will display a list of all objects that exist in the database but they have no files linked to them yet.