I have an existing 3-way switch. The pair of switches control my hallway light and works perfectly. To replace this, I bought a Kasa Smart 3 Way Switch HS210. Other than the copper wire , it has only three colored wires. Black, red and white. When I read the manual for the Kasa switch, it says it needs 4 colored wires. Do you know how to make this work ? I am trying to understand how the current switches work. Which colors are the traveller wires (both white and red, with no neutrals) ?
I am fine with sacrificing the 3-way nature if needed but I need to control this with a smart switch. So its ok if I can just replace one of them with just a smart switch if required. I can post more photos after disassembling if you have questions.
Update: I added the two pictures for the existing 3-way switch wiring. The red and black wire are on the right. The white and copper are on the left.