Re: files not showing up when using control+o?
That's because you're in an Explorer pane. What happens when you tab around? You really need to try to get your bearings about the content around you. An open dialog is a form of Explorer pane. Please explore the surroundings and report back with what you find.
Brian - Windows 10 Pro, 64-Bit, Version 1809, Build 17763
Puritanism: The haunting fear that someone, somewhere, may be happy.
~ H.L. Mencken