How to change the requestLegacyExternalStorage permission

Today I signed in to the Google Play Console and got a message I need to change the requestLegacyExternalStorage permission.
Here’s the message I reveived;
"We’ve detected that your app contains the requestLegacyExternalStorage flag in the manifest file of one or more of your app bundles or APKs.

Developers with apps on devices running Android 11+ must use scoped storage to give users better access control over their device storage. To release your app on Android 11 or newer after 5 May, you must either:

Update your app to use more privacy-friendly best practices, such as the storage access framework or Media Store API
Update your app to declare the All files access (MANAGE_EXTERNAL_STORAGE) permission in the manifest file, and complete the All files access permission declaration in Play Console from 5 May
Remove the All files access permission from your app entirely

For apps targeting Android 11, the requestLegacyExternalStorage flag will be ignored. You must use the All files access permission to retain broad access.

Apps requesting access to the All files access permission without a permitted use will be removed from Google Play, and you won’t be able to publish updates."

I am still using 4.25 for this project, due to instant crashing of the engine when I open in 4.26, so I do need a work around.
Anyone any thoughts on how to resolve this issue?

Thanks in advance