Is there some way to make Mailbox for Mac access my Mac "Contacts" for recipients?

I'm using the Mailbox for Mac app.

When I type names into the recipients field, it shows me some names (I assume they're names in my gmail contacts, but I'm not sure).

But it doesn't show me names in my contacts. I think it used to, but I know other clients I've used have offered me both the contacts taht gmail's servers have for my account AND the contacts on my Mac. So...

Is there some setting or trick to get Mailbox to access my Mac contacts?