How to give an app permission to write to external SD on a rooted phone I have a rooted Galaxy S7.  I'd like to give permission to an app that does not request it to write to the external SD card storage.  How can I do this?
If you know the app package name, you can try the shell command pm grant.

Enable USB Debugging, probably already done for you, then type adb shell pm grant [replace_app.package.name] android.permission.WRITE_EXTERNAL_STORAGE hit enter. Your app should now have that permission.  Not sure if permanently though.