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OVERVIEW
This article outlines collaboration on files on Microsoft Teams.
Teams makes it easy to share files and work on them together. Files uploaded and shared to a team are accessible to every member of the Team. You and your team members can co-edit Word, PowerPoint, or Excel documents.
If you and your team members are editing it at the same time, any changes will be seamlessly merged as you work.
DETAILS
Step 1. In a channel conversation or in the Files tab, select "More options" icon next to the file.
Step 2. Choose if you want to edit the file in Teams, on your desktop, or in browser.
Note. Linux users won't be able to open files in the Office desktop app.
For a visual walk-through on how you can collaborate on files, watch this video.