Heat oven to 350°F. Lightly butter a 9x13-inch baking dish.
Spread apple pie filling in the dish. Stir in cinnamon, salt, and 3 tablespoons caramel.
Sprinkle dry cake mix evenly over the apples. Tap the pan to level.
Drizzle melted butter over the dry mix, covering as much of the surface as possible.
Scatter pecans on top. Drizzle the remaining caramel over everything.
Bake 38–42 minutes, until the top is golden and the edges are bubbly.
Cool 10 minutes. Serve warm, optionally with vanilla ice cream.