A free app for Android, by SteinSoft.

If you are a power user and your device is rooted, you can apply changes to system data, including backup files, remove unwanted applications, and more. If you are a standard user, and you don’t want to see the internal memory, you can choose to hide it from view. This prevents you from accidentally changing something in the system.

With this app, you can manage your files and folders, such as compressing them to zip files and sharing them through other applications, like WhatsApp, or sending them through email, etc. It also features built-in viewers and players so that you can play music and videos, view images, and more.