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iDron - I suggest the following steps
First open the plugins configuration screen and hover the mouse over the each of the field titles - that will give you a good idea of what the options are and what custom columns you might need to create:-
Now create the custom columns you want, I only want the full path, so I define one custom column, thus
Now go back to the plugin configuration and plug in the column name where the file name, in my case the full path, will be stored
Now when I add a book its path will stored in the column I created
BR