I am not sure that my certificates are the problem. I have created certificates in my apple account many days ago.
Since the Expo documentation does not explain how to upgrade an app, I try to search in Google for this. All articles tell me to open the app in Xcode. But how do I open an excode app in xcode?
This thread asks the same, but no answer is given.
It seems I need to add the new app version to Itunes Connect and this can be done via Xcode:
