How to get iMessage across all devices?

I have an iPhone X and I'm trying to reactivate my iPhone 6 (yes, ignore the fact that I'm going from an X to a 6). I'm having an issue however, where my old messages that I sent from my X aren't showing up on my 6. Is there any way to transfer these without doing an iCloud backup and restore?

Not at the moment no. In one of the IOS 11 betas, Apple did introduce message syncing however it was buggy so they haven't released it yet. When it does, it will store your messages in the iCloud which can sync to your other device, the same way your contacts does.

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