How to import new customers from Zoho CRM?

I have Zoho Invoice up and running, have imported some customers from Zoho CRM, and am able to update those customers in Invoice when they have been updated in CRM.

I can't seem to import a new Zoho Invoice customer from Zoho CRM.

Am I doing something wrong, or am I stuck with a one shot deal to import contacts from Zoho CRM?