Download Android APK not signed with my custom certificate

I uploaded and set the alias keystore for my Android APK signing. But when I download the APK and manually try to publish it, I get a message: 'You uploaded an APK that is signed with a different certificate than your previous APKs. You must use the same certificate. Your existing APKs are signed with the certificate(s) with fingerprint(s):'

I guess the custom keystore is used only when publishing to Google Play directly from FlutterFlow. This feels like a bug? Does anyone have a different experience?

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