If Sidesync Not Work On Your Handset then flash your handset with this ver: J320HXXU0APBA_J320HOJV0APC2_PAK
Firmware Link: https://goo.gl/R4TC0q
This method was tested On Samsung Galaxy J3 (2016) But it should work also on:
On Samsung Galaxy J5 (2016) J7 (2016), Glaxay Grand Prime
And All Other's Samsung Galaxy Models Version 5.1.1
You do this at your own risk! Make sure your phone battery is fully charged!
If you reset your phone, all your data may be lost, so do a full backup before start operation.!