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On the left, select Chat or Teams and a channel.
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Choose an existing conversation, a meeting chat, or select New chat or Start a post.
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Select Apps and actions and then Attach files in the chat or post window, and do one of the following:
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Select Upload from this device, choose a file to upload and select Open. If you see a message about sharing, select the file and choose how you want to share.
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Select Attach cloud files, choose a file, and select Attach. If you see Upload a copy, or Share a link, choose an option.
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Select Browse Teams and channels (in channels only), choose a file and select Attach.
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To share with others outside the chat, see Share files in Teams.