To enable access to a created instance from an external network, it is necessary to separately assign an IP address (floating IP address) for external connections to an instance after it is created using a stack.
After an instance is created, loads will not be distributed to the new IP address even if the IP address of a distribution destination instance registered in Load Balancer is changed.
When the properties are changed on updating a stack, the properties after the change are reflected to newly added instances or redeployed instances.