The information in this article applies to all Dropbox users.
You can comment on a specific part of a file if you're on dropbox.com and working on a supported file type. To do so:
Learn how to comment on a video or audio file.
Learn how to edit, delete, or hide comments.
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Work more efficiently with collaboration tools like mentions, comments, and tasks.
Learn how to how to leave a comment, edit or delete a comment, and hide comments on Dropbox files and videos.
Live review sessions in Dropbox Replay allow real-time collaboration on audio and video files. You can see what your collaborators are adding, too.
Learn how to turn off comment notifications and disable the comment feature.