Do not mix anything. Simply layer the ingredients as follows:
Spread the cherry pie filling evenly in a 9x13-inch baking dish.
2 (21-ounce) cans cherry pie filling
Pour the crushed pineapple (with its juice) over the pie filling, spreading it out evenly.
1 (20-ounce) can crushed pineapple
Sprinkle the dry cake mix over the top, ensuring it covers the fruit completely.
1 (15.25-ounce) box vanilla cake mix
Arrange the butter pats evenly across the surface.
2 sticks salted butter
Sprinkle the coconut over the top.
1 cup sweetened shredded coconut
Finish by adding the chopped pecans.
1 cup chopped pecans