Slow-Cooker Smoked Chicken and Shrimp Gumbo

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6 tablespoons unsalted butter

1 tablespoon liquid smoke 

1/2 cup all-purpose flour 

1 medium white onion, finely chopped 

1 green bell pepper, finely chopped 

2 stalks celery, finely chopped 

2 cloves garlic, minced 

2 1/4 pounds skinless, bone-in chicken thighs, trimmed of excess fat 

6 cups low-sodium chicken broth 

3 tablespoons Cajun seasoning 

1 tablespoon file powder (gumbo seasoning, such as Zatarain's) 

1 1/2 pounds medium shell-on shrimp 

Cooked white rice and sliced scallions, for serving 

Cooked white rice and sliced scallions, for serving

Hot sauce, for serving