Hello - wondering if anyone has run into a similar issue or has a solution 

I have enabled the Knowledge Sidebar in my sandbox on cases. I can attach knowledge articles and share links to the case feed, however, when it posts to the feed, the post and article link is only visible to internal users. My intention is to allow the users in my community (who submitted the case) to be able to see the knowledge article/link as well. Is there a sharing rule I need to set up or privacy setting I need to check/uncheck?

Thanks in advance!