Error 908: Read and Write Permission External Storage Denied

Hello,
Could someone please tell me, what should I please do against the error message "Error 908 Read and Write Permission External Storage Denied"? I saved today the app Wetterfrosch Sunny with the SDK 34 and I wanted to upload it on Google Play. But when I tested the app, I got this error message.

In case, that are changes within the app are necessary, could someone please tell me, how to program the permission within the app? I do not remember very well.

On the internet I only can find the advice to activate the permission on the phone. But this also does not seem to work. The DefaultFileScope of the app is "Legacy" and I uploaded the extension, which Anke has recommended in February 2024. But still the error persists. I need to upload my apps until August, 31 on Google Play. I had no idea, how to increase the time for this change on Google Play, even if it is possible. Thanks!
Kind regards,
Martina

Update: It seems to be an Android 13 Problem. We have Android 13 devices and one Android 11 devices. The error occurs on the Android 13 devices, but the app Shows the permission correctly on Android 11 Phone. Is It possible to Upload the app Wetterfrosch Sunny on Google Play? Thanks.Martina