ISSUE:

Users are sometimes reporting the issue that they make adaptations or comments in a PTP document they have to review. 

When they open the document again, the changes have disappeared.

ROOT CAUSE:

When using the CHROME browser to open the document to review, the document is downloaded to your downloads folder and not updated on the form.

RESOLUTION:

Use the EDGE browser to open the document to review.  This enables you to make modifications to attached documents directly on the SharePoint server.