Applies to: Microsoft Teams.
If you want to share one file to several areas in Teams without uploading a copy each time, acquire a link to the file and share that as a substitute.
Share to a channel
In the Post tab where conversations occur, choose Choose file underneath the box where you write your message, then pick Browse Teams and Channels. Click the file, then tap Share a link.
Note: Teams posts your link to the channel, including the name of the team and channel where the file is stored.
Share to a chat
Find the channel where the file is stored. Pick More options > Get link. As a result, you are able to paste the link into any chat or channel.