Signal has a lot of problems with changing devices while preserving history. As in it's often just impossible.

	▲	ants_everywhere 4 days ago \| parent [-]
		I think so, this looks like the feature where adding an new linked device transfers messages from your phone. What still isn't possible as far as I am aware is transferring messages from Android to iOS or vice versa. Last time I looked into this was a few weeks ago.