"Builds & Release" allows you to select uploaded builds and submit your app for review. You can upload signed IPAs directly to AppManager via our API or the web interface. We then submit the builds directly to App Store Connect.
Please make sure that you correctly sign your IPA and use the correct bundle identifier and version/build codes. At the moment we cannot validate any of these information on the fly and you will only receive the final validation from App Store Connect via email.