Share a file to multiple channels in Teams
If you want to share a single file to multiple locations in Teams without uploading a copy every time, get a link to the file and share that instead.
Share to a channel
In the Post tab where conversations happen, select Choose file 
beneath the box where you type your message, then select Browse Teams and Channels. Select the file, then select Share a link.
Note: Teams posts your link to the channel, including the name of the team and channel where the file is stored.
In the Files tab of a chat or channel, tap More options 
> Copy link to get a share link. Then, you can either send in a message, or share in the app of your choice.
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