You can start a discussion by adding a comment to a file or folder. For example, you might want to ask a question or ask someone to review changes you’ve made. When other users reply to your comment, their responses are shown below your comment so you can easily track the discussion.
The Comments tab in the Activity panel shows all of the comments added to the file or folder. Comments can be seen by all users who have permission to access the file or folder.
For files, you can add comments to a specific version of the file. The file version number is shown in the comment.
