I have been facing this a lot.
Problem
It happens when you have not created a new listing for your update and are trying to upload that version from Xcode.
Solution 1
The solution is to create a new release and then try to upload the build. you will have to increment the build number

Solution 2
If you are using the permission_handler package then please check your mail.
Appstore is rejecting your build because your code references many features that require a permission string.
There is an easy fix to remove unnecessary permission by adding some code in Podfile. For instructions specific to the plugin “permission_handler” please refer to this file https://github.com/Baseflow/flutter-permission-handler/blob/master/permission_handler/example/ios/Podfile
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