What was the last version of Android which allowed apps and user to have full read and write access along with all copy move or delete operations of everything inside the internal storage?
Currently, I am using a Samsung Galaxy S8.
The last Android version that used what is now called the legacy external storage system
was Android 10. In that system all apps could request full read or full read&write access to the shared internal storage.
Starting with Android 11 apps have to use scoped storage
by default. Only older apps targeting Android 10 are able to request access to internal storage using the legacy storage system. Storage updates in Android 11. And I think I have read that it also makes a difference if your phone has been upgraded from Android 10 to 11 or if it was originally released with Android 11.
On Android 12 and newer it doesn't matter which Android version the app is targeting, they all have to use the scoped storage system without any exceptions.