I need to save files to the root volume directories.

To do this I’m using

WRITE_EXTERNAL_STORAGE 

permission for old devices and

MANAGE_EXTERNAL_STORAGE 

for newer ones.

Currently I am able to write files to any volumes on any Android version except for Android 10 (29 SDK). As for this Android version, I am able to write a file to a primary external volume (internal memory) but when I try to save a file to secondary external volume I receive java.io.IOException: Permission denied exception.

Manifest permissions:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>

<application
  android:requestLegacyExternalStorage="true"

option is set.

Any ideas on how this is to be done without SAF?