Chicken Sausage Gumbo

Name: Chicken Sausage Gumbo
Ingredients: 2 Tbsp. oil; 4 chicken thighs (bones and skin removed); 1 cup diced andouille sausage (or more, to your taste); 4 Tbsp. melted butter, plus enough vegetable oil to make a half cup total; 1/2 Cup all-purpose flour; 1 cup coarsely chopped onion; 1 cup coarsely chopped bell pepper; 1 cup coarsely chopped celery; 4 cups chicken stock (home made or purchased); 1 cup sliced okra (fresh or frozen); 2 bay leaves; 1/2 Tbsp. cajun seasoning; 1 tsp. paprika; 1/4 tsp. cayenne; salt, to taste; 2 tsp. filé powder