Trying to build a React Native app that injects a menu item in the Share menu (Share Action for Android, Share Extension for iOS) and receives shared items in the app. Is there
You can use the built in component: https://facebook.github.io/react-native/docs/actionsheetios.html#content
Or you can use this component which can accept any view you want and makes it look like the iOS share component:
https://github.com/eyaleizenberg/react-native-custom-action-sheet
These are designed for iOS. For Android (and also iOS), you can use this: https://github.com/EstebanFuentealba/react-native-share