Go to the SharePoint site we want the documents from (source)
Copy the address from the browser
Go to Teams
Go to the Team you want to copy to (destination)
In the Files section Add Cloud Storage
In this window choose SharePoint
Choose Use a SharePoint link and paste the previously copied address into the box then click Go
Confirm its the correct Team and click Next
Choose Documents and click Next
Another confirmation dialogue box – click Add folder
You will now have those Documents in this Team
Please note that this embeds the document folder in here. Any changes will be in both locations