Pack the ipa package and upload it to the AppStore, you will encounter various problems wonderfully.
1.App Store Connect Operation Error
Reason 1. The computer memory is insufficient. At that time, my computer memory only had more than 2 G left. After cleaning up the memory (restart the computer at last), and then repackaged it, it was ok
(A link to clean up computer memory is attached: https://www.jianshu.com/p/b2dad7b19c6c )
Reason 2. It may be due to the cache. Close Xcode and open it again. Clear (control+command+K) and repackage.