From the pdf Settings, we can add a comment to a pDF
How ever we cannot set the audience for the comment it will be visible to all users.
Same if we annotate a PDF from the markup.
Request is to allow comment creator to set the audience for a comment private or public and if public who can see it.
Example the electrician may wanted to leave a comment to the ventilation group. So yes we can tag a person in comment.
Someone may wanted to flag a issue for the Healh and Safety
Apply to Synchro field as well