Yea, their implementation is really lacking. @ and # lookups are non-existent. No support for multiple images. I’ve basically given up on the HS social media posting, except for those campaigns that I really need / want to track.
About the only thing that you can really do, is to put replace your link, temporarily, in your profile and direct people to use that link, and then put it in as a trackable URL. LinkTree does this very well, for linking to multiple sites/landing pages.
Scott