A bookshop app earns its camera by saving typing: scan the barcode on a book and BookNest finds it. This section uses expo-camera (57.0.5) for the preview and barcode scanning, expo-image-picker (57.0.20) for photos the reader already has, expo-video (57.0.5) and expo-audio (57.0.5) for playback, and expo-file-system (57.0.7) to upload a photo. All are native modules; each npx expo install needed a new development build.