This app version already exists in the App Repository! Upload a higher version and retry.

This app version already exists in the App Repository! Upload a higher version and retry.

Why can't I update from version 2.95 to 2.96?
I have followed the document 
It is recommeded the app size doesn't excedd 1.5 GB. Further, MDM also recommends to upload only signed APK and also, ensure the existing APK and the updated version of the APK have the same signature but different version code and version name.

I have changed the version code and version name too.
I am trying to update an android enterprise app. In the past I deleted the old app and uploaded the new one but now I have unsynced devices so I cant delete the existing one.