Should you come across an Access Denied again when working with your files then you can add Take Ownership to your right click context menu.
I have this installed on my Win 10 machines and when you right click on the file you want copy into somewhere on your computer, just right click on it and select Take Ownership.
https://www.tenforums.com/tutorials/3841-add-take-ownership-context-menu-windows-10-a.htmlThis is a more simplified method than the one you have linked.