Secure Decorative Post Trim

What happens here

A person wearing a hat and sunglasses is shown carefully aligning a pre-cut decorative trim piece around the top section of a structural post, specifically where the post meets the overhead soffit or beam. The trim piece appears to be made of a wood-composite material, cut to fit the corner of the post. After ensuring proper fit and alignment by pressing it into place with both hands, the person uses an air-powered nail gun to quickly secure the trim to the post. The distinct sound of the nail gun indicates that multiple fasteners are being driven into the material. Upon successful attachment, the person gives a thumbs-up, signaling satisfaction with the result.

Goal: Permanently attach the decorative trim piece to the post