iOS Devs: How to prep your app for Apple’s Test Flight

• Configure Build Settings: Ensure your app’s build settings are configured correctly for distribution, including versioning and other necessary options. 
• Generate Build: Build your app for the target architecture (e.g., any iOS device M64). 
• Archive the Build: Archive the build using Xcode’s Product > Archive menu. 

• Distribute the App: After archiving, click the “Distribute App” button in Xcode.
• Select Distribution Method: Choose “App Store Connect” as the distribution method to upload the build to TestFlight.
• Upload the Build: Follow the on-screen instructions to upload the archive to App Store Connect. 

• Access TestFlight: In App Store Connect, navigate to your app and then the TestFlight tab.
• Fill out Test Information: Provide details about the build, such as internal and external tester groups, and any specific testing instructions.
• Add Testers: You can add testers either by their Apple ID or by sharing a public link.
• Send Invitations: Send email invitations to testers to install the TestFlight app and test the app. 

• Install TestFlight: Testers need to install the TestFlight app from the App Store. 
• Accept Invitation: Testers will receive an invitation to test your app in TestFlight.They need to accept the invitation and install the app. 
• Start Testing: Once installed, testers can use the TestFlight app to test your app and provide feedback.

Via: Google.com