Is this compatible with a Galaxy Note 3? I have Android version 5.0. Or should I download the 4.0?
Version 4.0 of the SideSync application is compatible with the following devices:
All Samsung Android phones Galaxy S III and later running Android KitKat 4.4 and above. All Samsung Android tablets running Android Lollipop 5.0 and above.
Your phone needs to have Android 4.4 or later and it should work properly.