Hi Carol,
My name is Didi, an Independent Advisor.
As suggested by Teams Engineering from the link given above, "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."
For details about cross-posting, please check out the link:
https://support.microsoft.com/en-us/office/cros...
To move files, go to the Files tab under the channel, select the files you want to move or copy. Click on move or copy. To select a different team as the destination, click up two times until the list of teams appears. Then, select the team you want to move the files to then the channel and click move/ copy.
Source: https://answers.microsoft.com/en-us/msoffice/fo....
I hope this helps.
Kind regards,
Didi