Issue found: 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.
Core functionality is defined as the main purpose of the app. Without this core functionality, the app is "broken" or rendered unusable. The core functionality, as well as any core features that comprise this core functionality, must all be prominently documented and promoted in your app's store listing description on Google Play.
Update your app so that the feature doesn't use this permission. If your app doesn’t require access to the MANAGE_EXTERNAL_STORAGE permission, you must remove it from your app's manifest in order to successfully meet the policy review requirements.
Alternatively, if your app is “broken” or rendered unusable without this permission, it’s likely your earlier declaration was misstated or is unclear. Ensure that the core functionality and technical justification are clearly documented and promoted in the app's description when you complete the Permissions Declaration Form, and resubmit your app on the Play Console.
To bring your app into compliance, follow these steps:
Follow these steps to bring your app into compliance:
Review the All Files Access Permission policy.
Read more about Use of All files access permission to better understand permitted and invalid uses.
Review Android storage use cases and best practices for common storage use cases.
If your app meets the requirements of permitted uses, read how to Declare permissions for your app.
About the All Files Access Permission policy
Please help me I am updating the application and I am facing this problem. Can you please tell me what is the problem?