So, I selected an album in my library which shows up in Windows 10 as 'Unknown Artist' with track numbers, not names. When I originally ripped it, I manually added all the tagging in 'Action Window>Tag'. I have just done 'Tools>Library Tools>Update Tags (from library)' for that album. After a few seconds, I got a message, '16 files successfully updated'. When I went back into Windows 10 and opened my music files (stored on external drive), the album was still listed as 'Unknown Artist' even after a re-start.