It looks like your Arena link is to the overall Arena’s ‘Get Started’ page instead of to your actual analysis, please reshare the link; there’s a walkthrough on how to share in the below link:
In regards to your scenario though, if you’re able to share the Analysis again, I can test out a couple different options but Quick Sight really limits how much two datasets can interact with each other if not joined, so I don’t believe that this will currently be possible.