Where can I comment on files?
Who is notified when I post a comment, and how are they notified?
The owner of the file, anyone who has commented on the file, and anyone who was @mentioned in the file will be sent an email indicating that a new comment was added. These same people will also receive an in-app notification on the Dropbox website and on their iOS device (if they have one).
How do I let someone know that I commented on a file?
The owner of the file, anyone who has commented on the file, and anyone who was @mentioned in the file will automatically be notified of your comment. To notify someone else, you can @mention them to bring them into the conversation. You can do so by typing the @ symbol and beginning to type their name. (Do not add a space after the @ symbol.) If that person is in your contacts, an autocomplete option will be shown. If not, you can type the @ symbol, followed by their email address to notify them.
How do I @mention a user who isn't on Dropbox?
You can type the @ symbol, followed by the person's email address to mention them in your comment. (Do not add a space after the @ symbol.) They will receive an email to the email address you commented at, notifying them that you mentioned them in your comment.
Can anyone outside of my Dropbox for Business team see my comments?
Comments visibility is tied to the visibility of the file. Anyone who can see the file can also see the comments associated with it. If you've shared the file with people outside your company, they will be able to see all comments on the file.
How can I disable a file's comments from my browser?
In your browser, clicking on Options from the comments pane will reveal a dropdown. If the file is in your Dropbox, you can click Turn off comments to turn off all comments for that file.
How can I hide or reveal the comments pane from my browser?
You can hide the comments pane when viewing the file on the Dropbox website by clicking Options and then clicking Hide comments. To reveal the comments pane, click on the bar with the comments icon to the right of your document.
How do I unsubscribe from comments notifications from my browser?
When signed in and viewing the file on the Dropbox website, click Options from the comments pane. From the drop-down menu, you can unsubscribe from notifications. If another user mentions you in a comment, but you have unsubscribed from comments on that file, you will receive a notification for the comment that mentions you.
How do I unsubscribe from comments notifications from my iPhone or iPad?
When viewing the file on you iOS device, the bell icon at the top left of the comments pane indicates whether you are subscribed to comments. Pressing that icon toggles notifications on or off for that file.
Dropbox Comments FAQ: https://www.dropbox.com/help/9016