Need help to Understand

I recently received a play console policy update email.

We’re introducing policy updates that need your attention. You’ll have 30 days from the issuance of this notification to comply with the following changes:

Apps that target Android 11+ and need to access external storage must comply with the All Files Access Permission policy so users have more access control over their device storage.

What update I should make in my apps.

you should use the ASD - application specific directory…
you might wnat to do a search in the community for this