Portal-only customer is unable to retrieve attachment versions of attachments on the knowledge base page of the portal

Issue Summary

Portal-only customer is unable to retrieve attachment versions of the PDF attached in the knowledge base

Steps to Reproduce

1. Create a page in Confluence space integrated with the JSM project.
2. Attach some sample PDF documents to the page using the //attach keyword.
3. Log into the customer portal using portal-only customer.
4. Try accessing the PDF documents attached to the knowledge base page in the portal

Expected Results

The attachments should be shown as they are visible on the Confluence page.

Actual Results

Below error is received while browsing through the attachments:

Error retrieving attachment versions.

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available