Custom Message: See Most Current Message in Shares and Message All

[#1]

When you send a message for a stage, the team receives their email notification with that information. If you had created a new stage, the custom message defaults to what was originally created. if you create yet another stage or want to share or message all with the message in the 2nd stage, it would default to the original message, making you recreate the message.

How can we make the most recent message as the default and not revert back to the original message?