Microsoft is making the following changes to the file open experience in Teams that will affect users in select scenarios:
All files in Shared channels will now open in the browser instead of within Teams. This will ensure that you can access all the latest features and functionalities of the web app.
OneNote notebooks pinned to channels/chats or the Notes tab within channels will continue to open within Teams.
However, when launched from any other surface in Teams, OneNote files will open in the browser. This is temporary until Microsoft integrates the latest file open behavior into the OneNote Teams app. At this point, you can go back to working with these files within the Teams environment.
Word, Excel and PowerPoint files not pinned using the latest respective Teams apps must be re-pinned for edit-ready experience. This will enable you to edit and co-author the files directly from the tab without switching to another app or browser.
