Firebase Crash upload-sym script does not start when archiving

Question

I release my first beta versions in iTunes and I use Firebase Crash reports. I added a script as a build phase to load characters in xcode. It works fine with regular assemblies, but when I archive and load this assembly, there are no corresponding symbol files in the Firebase Crash reports. How can I load these symbol files when archiving? If this is not possible, how can I add them manually? With the first beta version of try, I got a crash message that gave me the necessary UUID. Then I downloaded it manually:

./Pods/FirebaseCrash/batch-upload ServiceAccount.json UUID

But this approach will always be after the fact and does not seem to be scalable.

Thank you for your help.