App windows disappear
I am trying to upload a file to Safari by dragging it to the Flickr upload screen. When in Finder, I click on the Finder window, Safari disappears.. I go to the dock and click on the Safari icon to see Safari. When I do that the finder window disappears
...How am I supposed to drag and drop a file like I have been doing since the late 1980s?
Where's: UNHIDE ALL WINDOWS? Am I missing something?
I Checked Finder and SAFARI settings, Finder and Safari VIEW and WINDOW menus, In System Settings I checked: Desktop and Dock, General, Appearance, and Displays, Privacy etc etc, .
Also why is Safari disappearing when I open the System Settings?
iMac, macOS 10.12