Contacts not syncing between devices
I have a MacBook Pro running OS X El Capitan 10.11.6, an iPhone 6S Plus and an iPad Pro both running iOS 9.3.3.
My problem: I am having a conversation in Messages on my phone. I switch over to Messages on my laptop, and the conversation is there, but the contact is just showing the person's phone number, no name. In another instance, a text conversation I'm having on my phone will be visible on my tablet, but the contact information is missing. I most frequently enter new contacts on my phone, occasionally on my laptop, and almost never on my iPad. My understanding was that syncing Contacts between devices should take care of this. Why isn't it? Shouldn't it just automatically add them to whatever list is being kept and sync them?
On both devices, I've selected to sync both my iCloud Contacts and my Gmail Contacts. I have synced both devices to my laptop numerous times. I have updated all my devices and my laptop to the latest software as of July 21, 2016.
MacBook Pro, OS X El Capitan (10.11.6)