Potty training question!

Sarah

We started potty training my son who is almost 3 and he has got going pee in the potty down great. Tells us when he has to go and stays dry. But he won’t poop in the potty. We tried for days and he was just holding it and in a rotten mood so we put pull ups on him and he poops in them happily while still keeping them dry for pee.

My question is what do I do from here? When he does poop in his pull up, do i lay him down and change him just like usual? Or do I make sure he sees me put the poop in the potty? Just looking for some pointers here.