Thank you for that explanation. All these years using WA it never dawned on me to use 'Ctrl + E' in the media library to add info for non-tag-able files.
Within WA, I've mostly used the 'Alt + 3' editor unless I wanted to make the same tag change(s) to multiple files. In those cases, I've always selected the option to update the tags. I used to wonder why that option was there. I mean why would you not want to update the files' tags with the changes.
The picture has become clearer! Thanx again!