If you, like me, are accustomed to micromanaging your files on your computer, the lack of a built-in file manager on smartphones can be a serious pain point. Why do I have to jump from app to app to manage files? Why can’t I do it all from one place? Sure, you can find various file management apps on Google Play, but Android itself never shipped with one. Until now, anyway.

Android 6 Marshmallow includes a hidden file manager that’s switched off by default, but you can switch it on quickly and easily if you know where to look.

Go to the Settings app then tap Storage & USB (it’s under the Device subheading). Scroll to the bottom of the resulting screen then tap Explore: Just like that, you’ll be taken to a file manager that lets you get at just about any file on your phone.
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https://www.greenbot.com/article/2996030/how-to-get-to-android-marshmallows-hidden-file-manager.html