If it helps, on iOS and Primal, I am zapping like this: go to the person’s profile ➡️ click on the QR code icon ➡️ select and copy the lightning address ➡️ go to my LN wallet and send Bitcoin manually.

I know it’s not ideal, and you can’t zap a specific post, but I add a little “hey, thanks for the post XY,” and it’s better than nothing, I guess. :)