@Bethel.8009 Ok, thnks. Yes, I think you understood. Maybe not worth doing if I have to swap which end the manual dimmer is at, but I am guessing maybe that is typically put at the line end.

@Bethel.8009 you seem to really know this stuff. Can you also tell me, since Kasa doesn't make a 3 way dimmer, can I replace the non-dimmer switch of my current 3 way with the Kasa 3 way and control...

got it. Thx!

Thank you so much! Looks like you need a voltage meter to figure out which switch is the power source?

Looks like you need a voltage meter to do that?

Thanks!