File Permission issues while launching App

Question

We plan to launch an app which needs access to user's folder permission to upload/save documents. However, play console is rejecting the app as it does not believe it is a core functionality. We have added the function "Manage_External_Storage" in our build but it is still rejecting as a core functionality error. We have also uploaded a video depicting the use case as well. The error is : **Not a core feature. The app feature that you declared as dependent on the All files access permission didn’t meet the policy review requirements for critical core functionality. **

We want to ensure we can access user's storage access to retrieve documents for our verification process. We have uploaded a use case video but still got rejected.