To add a comment to a file you click on the Actions and choose to add a comment. If a file has the comment icon filled with 3 lines, this indicates that the file has a new comment that hasn’t been read.

You can click on the comment icon to open the comments and Activity log sidebar, here you can view the comment or add your own comment:

When a comment is added to a file, watchers of that folder will get an email notification.
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