Edit the a polygon in Acrobat Reader

[WABirdNerd]

I have added a polygon shape to a PDF file via the comment section.
Can I now edit this existing polygon, add extra points, combine different shapes?

[try67]

No. Once added you can only move the existing points around, or move the entire polygon. You can't add or remove points. You'll need to create a new one to have more (or fewer) points. And you can't combine shapes at all.