what does the Append fc permission govern?

I thought that removing the Append permission from a file cabinet profile would remove the ability to clip documents to a document in the file cabinet but I'm wrong.  What does it do?

Dear Jon Weston! It looks like the Community cannot answer your question. Thats why we have opened a Support Request with the Number SR-119405-J3L9F for you. A Software Support Specialist will contact you directly to follow up. We will update this thread with the solution as soon as we have solved the Support Request. With Best Regards, DocuWare Support Team

Hi Jon,
that should be the functionality of the "Append" permission. Maybe the user has another profile assigned that gives him the right anyway?
Regards
Tobias Getz
Director Product