Got files stored in the cloud? No problem.
In the desktop or web app, select Files on the left side of Teams, and then select Add cloud storage.
Select your cloud storage service from the list that comes up.
Currently you can share files from Box, Dropbox, Dropbox for Business, Google Drive, Egnyte, and ShareFile in Teams.
Sign in with your account. You may need to turn off your pop-up blocker first.
Now you can add files from the cloud as well as from your computer to channels.
Note: Contact your IT admin if cloud storage options don't appear.