Is that Microsoft doesn't get this area yet.
When I include a folder in a library, then in File History when viewing files to restore, the folder that I added is not listed under that library. But all its sub folders are listed. But if include that same folder in File History by doing Start -> Settings -> Update & Security -> Backup -> More Options -> Add a Folder, then that folder does appear in the list of files to restore. Is this behavior by design? It seems whacky.

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