Just got back from being off grid for 2 weeks and it seems not all my messages have been synced from my iphone to Messages on my mac. I signed out and restarted a couple times and also hit "sync now" a few times and it seems I was able to get a few more messages to show up on my mac, but it is still not all of them. My understanding is that every single message on my phone should get uploaded to icloud and synced to all my devices. Is this correct? If so, why won't they all show up on my mac? It seems new messages are appearing ok but not all the older ones, although some have appeared which is why this is weird.