Some interactions leave your app's own views: a system dialog, the keyboard, links, the share sheet, the vibration motor, the clipboard. React Native 36,878 wraps each in a small API, and Expo 6,418 fills the gaps. This section tries them on the Android 16 emulator from src/interact/ in the BookNest project, and then uses two of them to let BookNest open a book from a link and share one. Logs come from Metro's terminal or, where noted, from adb logcat -s ReactNativeJS.