Issue
Symptoms
Comment field of knowledge article is not visible on Service Portal when "attachment link" checkbox is enabled
Release
Jakarta and above
Cause
When the "Attachment Link" checkbox of the KB article is checked, the comment field is not visible on standard Service Portal, however it is visible on the Knowledge Management Service Portal
Resolution
Activate the Knowledge Management Service Portal plugin
Additional Information
https://docs.servicenow.com/csh?topicname=knowledge-management-service-portal.html&version=latest