Buy 2 get 1 free issue

Hi there,

I’ve made a buy 2 get 1 free rule.

Eligibles products are from the same product tag. Actually, it automatically adds the cheapest product from the cart selection. Add product A and B to cart, get another product B free.

Is there a way to make the user can add the product he wants from the same product tag ? Add product A and B to cart, get product C free.

Here’s my rules :

– https://ibb.co/CQ0KfRk

Cheers!