Files uploaded and shared to a team are accessible to every member of the Team. In Office for the web, Office for Android or iOS, or the latest applications from Microsoft 365, you and your team members can co-edit Word, PowerPoint, or Excel documents, or comment on Visio files. No need to check files out or worry about if one of your colleagues has the document open. Just open the file you need to edit and if other team members are editing it too your changes will be seamlessly merged as you work.
Working in Microsoft Teams lets you work on files together at the same time. Also, messages about the document stay with it and will show up in your team conversations.
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In a team conversation or in the Files tab, select More options 
next to the file.
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Choose if you want to edit the file in Teams, on your desktop, or online.
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Edit the file. Colored flags show who else is working on it with you.
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Select Start conversation to add a message about the file.
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Type your message or @mention someone and select Send.
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