Help! I Just Brought Home A 6 Month Old Papillon Puppy…?

I am crate training my dog, he’s great. I take him out a times always with a leash and praise him for going outside but he has never piddled outside. He comes inside from a mile and a half walk, goes in his crate and piddles, he has no problem pooping on his walks. Help! I am so frustrated I want to enjoy him in the house but I feel uneasy about letting him run around until I know he will piddle outside. Thank you.