so, in react native specific platform Android, they gonna read bundled file which generated by minified of index.js to make it smoother when aplication run. If somehow the index.android.bundle
file not found, you can generate by your self.
run command npx react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle
it will generate fil index.android.bundle
under folder android/app/src/main/assets
after finish, can run using release version apk file or using command
npx react-native run-android --variant=release
ref: