It's a cheap solution, but I found some regex to replace all emoji before it's printed by STM with □. One emoji got turned into that separator there but I guess that's better than crashing Unity. I might just have it replace it with nothing, instead? Because I'm not allowed to include any emoji sets with STM since they all require attribution (section 1.2.i of the Asset Store submission guidelines) , I think... the best way to add emoji support would just be to go through whatever string you want to send to STM, and replace whatever emoji with whatever quad. It *is* possible to pragmatically generate/edit a quad, so maybe that could be used??