You don’t need to detach the app to deploy using fastlane.
exp build:ios produces an app-store-signed IPA of your app. If you want to use fastlane to deploy this to your testers via TestFlight, you can use fastlane pilot upload from the same directory where you’ve downloaded that IPA.
Thank you for your response, but I have noticed that the apk built using expo build:android doesn’t crash after install but the apk built using fastlane crashes immediately after opening the app. Let me know if there is a detailed tutorial on deploying expo apps using fastlane. The app size reduces from 20MB to 11MB, I am assuming it is because some files are missing when built using fastlane.
Please advice on good steps to follow while deploy expo using fastlane.