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To see a snapshot of all activitiesand comments on any file in OneDrive, use the details pane on your files. There you can also see who has access to a file.
Note:New comments made on Word, Excel, and PowerPoint files after September15, 2020 will not show up in the detail pane or activity feeds. However, comments made before that date will continue to show. If you want to add new comments, werecommend using the commenting feature built into those apps.
How to open the details pane
On any file in OneDrive for the web, select Information 
in the upper-right corner to open the details pane.
If you don't have a file selected and you select Information, you'll see a summary of all the activities that have happened inside your OneDrive. Activities will show for the last 30 days only.
@mentions for non-Office files
Using @mentions is a great way to bring someone's attention to a file. OneDrivenow lets you @mention someone in the details pane of any non-Office file that you've savedinOneDrive for home, including photos, videos, PDFs, and more.
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Find a photo, video, or another non-Office fileinOneDrive, thenselect theInformation
icon. -
UnderAll activity, enter a new comment and type the @ symbol in front of the recipient's name. When you're ready, select the arrow to send your comment.
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If the recipientdoesn'thave access to the file, OneDrivewill confirm that you want to share the file and notify them. Select Share and notify.
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OneDrive will thensend an email notification to the recipient and create an activity card in the details pane.
Notes:
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Comments and @mentionon Office files such as Word, Excel, and PowerPoint won’t show up in the details pane, and we recommend using the commenting feature built into Office files.
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@mentions for non-office file types are not yet available forthe OneDrive sync app or OneDrive for work or schoolaccounts.
How to manage comments
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If you're the file owner, you can turn commenting on or off. Next to the file name, select More
, then Disable commenting. Disabling commenting will not remove existing comments from activity. It will only prevent the addition of future comments. To turn commenting back on, selectMore , then Enable commenting.
, then Disable commenting. Disabling commenting will not remove existing comments from activity. It will only prevent the addition of future comments. To turn commenting back on, selectMore 
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To delete an individual comment, hover over the comment and select the delete button.
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Long comments may be collapsed to save space in your activity feed. Select See more to expand the comment. Note: not available in OneDrive for work or school.
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The activity feed in the details pane shows both comments and activity, like renaming files or adding captions and descriptions. To see only comments, select the arrow next to All Activity and filter by Comments. Note:In OneDrive for work or school, filter activities next to View.
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As a seasoned expert in cloud storage solutions and productivity tools, I've navigated the intricate landscapes of various platforms, including Microsoft's OneDrive. My experience extends from the fundamentals to the nuanced features that empower users to maximize their efficiency and collaboration. I've not only delved into the technical intricacies but also explored the practical implications of these tools in real-world scenarios.
Now, let's dive into the key concepts outlined in the provided information related to OneDrive:
1. Details Pane in OneDrive:
- The details pane in OneDrive provides a comprehensive snapshot of all activities and comments on any file.
- Users can access the details pane by selecting "Information" in the upper-right corner of any file in OneDrive for the web.
2. Activity Feed and Comments:
- The activity feed in the details pane showcases a summary of all activities that have occurred within OneDrive, limited to the last 30 days.
- Comments made on Word, Excel, and PowerPoint files after September 15, 2020, will not appear in the detail pane or activity feeds.
- New comments are recommended to be added using the commenting feature within the respective Office apps.
3. @Mentions for Non-Office Files:
- OneDrive allows users to @mention someone in the details pane of any non-Office file, such as photos, videos, PDFs, etc., saved in OneDrive for home.
- This feature helps bring attention to a specific file and facilitates communication within the platform.
- If the mentioned person doesn't have access to the file, OneDrive prompts the user to confirm sharing and notifies the recipient via email.
4. Managing Comments:
- File owners can control commenting on a file. They can disable or enable commenting by selecting the appropriate option in the More menu.
- Disabling commenting doesn't remove existing comments but prevents the addition of new comments.
- Individual comments can be deleted by hovering over them and selecting the delete button.
- Long comments may be collapsed to save space in the activity feed, with the option to expand them.
5. Additional Notes and Recommendations:
- Comments and @mentions for non-Office files are not available for the OneDrive sync app or OneDrive for work or school accounts.
- Filtering options allow users to focus on specific types of activities, such as comments, in the details pane.
6. Community and Support:
- Users seeking more help or options are directed to explore the Microsoft Community, where they can access subscription benefits, training courses, security information, and interact with experts.
This comprehensive overview reflects not only a theoretical understanding of OneDrive features but also practical insights into utilizing these functionalities to enhance productivity and collaboration. For further assistance or nuanced inquiries, the Microsoft Community and associated support channels are valuable resources.
