Polyline annotations are not exporting/appearing properly. Please see if you could reproduce this issue at your end as well. You can see this screenshot in order to visualize the issue. Furthermore, I am not able to view strikeout and underline annotation in the exported document.
This issue is mentioned in https://helpdesk.groupdocs.com/scp/tickets.php?id=51.
Polyline annotations are not exporting/appearing properly. Please see if you could reproduce this issue at your end as well. You can see this screenshot in order to visualize the issue. Furthermore, I am not able to view strikeout and underline annotation in the exported document. This issue is mentioned in https://helpdesk.groupdocs.com/scp/tickets.php?id=51.