Our messages can support threaded replies 1-level deep. This is a great structure to encourage conversations in the main chat...and in side conversations.
To reply to a message on the main thread, simply click the reply icon below the message you want to reply to. This opens the side drawer that displays other replies, and a field to submit your reply.
As on the main chat, replies are immediately visible to all chat participants currently viewing the chat in real-time, without the need to refresh the page.