Hi.
a)
There is a related list that you can simply put on the knowledge article's form called "Attachments". If you are using V3 Lists, you can then easily create a filter that checks the related list.
b)
You could create your own database view involving the sys_attachment and the kb_knowledge table.
But be careful: database views are only recommended for reporting and may have a performance impact, if the view is used extensively
Kind regards
