Mac appIn developmentSwitched off for every customer.
Windows appNot availableThe Windows app has no equivalent.
In development in the Mac app. It is not available to customers yet. Do not promise it.
Chat references are built but switched off for every customer, so they must not be promised.
What it is meant to do
Typing # in the message box would open a list of your past chats. Each row shows the chat's name and a one-line summary. Pick one and a reference to that chat goes into your message, so Haruno can look at it.
History would also get a Reference in Chat command. It adds the reference to the message you are writing.
A committed reference would show as the chat's name. So would a chat that a reply mentions.
The list needs memory to be on. If it is off, the list says Turn on Use memory in Settings. With no match it says No matching chats.
What a customer sees today
Nothing. # is ordinary text in the message box. History has no Reference in Chat command.