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Microsoft in their infinite wisdom has replaced the Hide Desktop icon with Copilot.
(programming.dev)
This is a most excellent place for technology news and articles.
Even point 4 is something I have never experienced, and is probably also lack of understanding.
A filesystem is either mounted or it isn't. Mounted for one program but not for another doesn't exist. If they don't see it in the filepicker, they probably just don't know the mount point.
Point 4 is listed twice in the comment. So I used "4 (2)" to point out what I was responding to. The second point 4.