How to hide files and folders on Android without installing paranoid apps - Android

For times when your smartphone ends up in foreign hands, having the ability to keep certain content, such as photos and videos out of sight could be considered essential. Being Linux-based, Android already offers a primitive, and totally working solution for making certain files and folders accessible only via a file manager app, and nothing else. It's not only simple, but it will also spare you from searching for a dedicated file hiding app.