The Box for Microsoft Teams integration enables you to use the content you have in Box through the familiar interface of Microsoft Teams. Share and access content stored in Box directly from within Microsoft Teams.
You are now able to edit your Microsoft 365 files stored in Box directly from within Microsoft Teams. You can make changes to the file without leaving the Microsoft Teams platform, and all changes will be automatically saved back to Box.
To edit the file, simply click on the “Edit” button that is displayed on the content card of the file shared in a chat or channel, or click on More Options and select “Edit”. This will pull up the Microsoft Online version where you can start editing.
This feature is now available to all users with no additional admin setup required.
More information: Using Box for Teams