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Add a cloud file to a channel conversation
If you haven’t already, add your cloud storage service to Teams.
In the desktop or web app, go to the conversation, click Choose file beneath the compose box, and pick your cloud storage service from the menu. Now you can pick the file you want to add.
Note: Contact your IT admin if cloud storage options don't appear.
Add a cloud file to a chat
We don't currently support sharing files from cloud storage services like Box or Dropbox in one-on-one or group chats. You can still attach files from your OneDrive account to a chat message, though.