I'm sure that this is already discussed so I apologize for having to post a new thread on it.
I searched and couldn't find it.

Objective:
When I reply to a message in a folder such as "Golf team", I expect that the message I'm sending becomes part of that conversation and is saved in that conversation's folder. However, it doesn't seem to be the case. Am I missing something obvious? Is this covered some place else that I couldn't find by creative searching? If so, please point me in the right direction?

Thanks for everyone's time and bandwidth.