The Files app is iOS 11’s Finder. You can use it to browse the files in your iCloud Drive, along with files and folders in your Dropbox, and inside other apps that open up their file systems to iOS. In the latest public and developer betas, Apple added some keyboard shortcuts to the Files app. This lets you carry out many common tasks without touching the screen when you have a hardware keyboard attached.
Most of the new keyboard shortcuts are great, and show how serious Apple is about the new user-accessible iOS file system. But some serious limitations mean you’ll still need to reach up and tap the screen to do the most basic things.