if you have an existing post that you want to show in a different channel, you can edit the message and cross-post. This will add the top-level post to the different channel, but will not include the full set of replies. We will keep this request in mind as we evolve the cross-posting feature in the future and update if the status changes.
Details on cross posting can be found here: https://support.office.com/article/cross-post-a-channel-conversation-in-teams-9c1252a3-67ef-498e-a7c1-dd7147b3d295.Steve McGee commented
People start using email when admins can't control and manage Teams properly. Being able to put conversations where they belong is essential.
This item is still in the works.
Also, thank you for the additional feedback. I will circle back to the feature team and provide a new update soon.
-WarrenSteve McGee commented
Exactly. Total pain. Sharepoint, Teams, etc. is all a mess. Like Google designed it.