Samsung Galaxy S4 - Contacts only syncing one way

[RexBuck]

I am relatively new to Android and have a Galaxy S-4. Have just started using GMail.

I have a complete list of my contacts on my phone and none of these are syncing to my GMail account. I have added a few contacts to my GMail account and these are being synced to my phone.

Any suggestions on how I can get the contacts on my phone to automatically sync to my GMail account?