A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear Avogo,
If you mean the Notes tab in Teams, it is a team notebook and will not be showed in File. It is in the Site Assets library. You can access it via Open in SharePoint>Site contents>Site Assets to find it.
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If you add a notebook via the OneNote tab in Teams, the notebook will be showed in Files in Teams.
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However, the notebook type file isn't like the Word file with the Viewer feature by clicking on Details. So I'm afraid that you may have no option logging the viewer in SharePoint Online or Teams now with the notebook type file.
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The only thing you can do is to see who modified the pages of each sections in the notebook. You can go to https://domain.sharepoint.com/sites/sitename/Shared%20Documents/Forms/AllItems.aspx?id=/sites/sitename/Shared%20Documents/notebookname to access the notebook folder to see who modified the section pages or sections. The URL in my environment is https://contoso.sharepoint.com/sites/TeamDemo0ABC/SiteAssets/Forms/AllItems.aspx?id=%2Fsites%2FTeamDemo0ABC%2FSiteAssets%2FTeam%20Demo%200ABC%20Notebook.
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As our product developers are willing to hear users' requirements, I suggest you submit your feedback and convey your suggestions to our new Feedback platform mentioned in the following article for the product developers to know your suggestions and opinions for product improvements.
Introducing Feedback for Microsoft 365 - Microsoft Community Hub
Please note the platform page will be loaded after some time based on the network environments.
You may access the page as follows to submit the feedback as well.
You may use a personal account or a Microsoft 365 business work or school account to submit the feedback.
Thanks for your understanding.
Have a nice day!
Sincerely
Cliff | Microsoft Community Moderator