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
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.