1. Head to Google Contacts.
  2. On the left, Under More - click Import 
  3. Then click Import  CSV or vCard file  - select file
  4. Click Import.
  5. On the left hand side you will see your groups if you categorized them in your spreadsheet - if not you will just Imported {Date} 

  6. In order to reduce the number of duplicates (if any) Select Find & Merge Duplicates. Google will collect fields that are similar i.e same phone number/names and merge them.

  7. Within minutes your contacts will sync within Engage