Apple Discontinued Application Loader from Xcode 11
Since XCODE 11 released, Apple discontinued the Application Loader, allowing to upload apps through directly Archive organizer into XCode development framework.
Here a bypass to keep uploading products realized with external development engines.
1) OPEN TERMINAL
2) CD TO THE PATH OF CURRENT .IPA GENERATED BY GAMESALAD
3) SEND THE FOLLOWING LINE COMMAND
xcrun altool --upload-app -f "gamesaladbuild.ipa" -u $USERNAME -p $PASSWORD