Within each Microsoft Team there are one, or more, channels where more focused discussions take place. Each channel has its own file folder where you can share files with that channel. To access that folder, go to the channel and click Files on the tabs above the conversation window.
Note: Make sure to use the Files tab at the top of the channel conversation window instead of the Files button on the left-hand navigation pane. The Files button on the navigation pane gives you access to ALL of your cloud files, rather than just the files for that specific channel.
In the library, you can upload existing files or create new ones.
Upload existing files
There are two primary ways to upload existing files into your library. Both methods start by going to the Files folder for your channel and both methods, by default, upload copies of your files to the channel file folder.
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Drag and drop - Using your mouse, drag the file from where the file is currently located and drop the file on the Teams window among the files. You can also easily upload multiple files using this technique.
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Upload - If you click the Upload button, a File Explorer dialog box will open, allowing you to select the file (or files) you would like to upload. Select those files and click Open.
Any files you upload will be accessible by any member of your Team.