Upload to App Store Connect
Submitting your app for iOS requires uploading the app to App Store Connect, and then submitting the app for review.
You must have already created your app store listing in App Store Connect.
Upload Your iOS App to App Store Connect
Visit the Build and Preview tab, expand Device Builds, and select the Submit to iOS App Store build and click Build App.
If this is not your first upload, make sure you increase the version number of your app first.
Give the build 20 minutes to complete, you should receive an email. After it is complete, you must wait a few hours for the app to process in the app store, then submit the app for review.