How do you watch a replay of a battle that you saved? I’ve looked around the menus, but have not found it.

you cannot watch a replay but if you go to play that mission as a defender, you can then play against scripted ai, which lets you choose one of your saves to be the attacker.

Perhaps having replays in a later update? I love to watch the game, as the units look really cool, but in the game, you have to concentrate on placing units. Maybe in a later update make replays where you can watch the game?