What instruments are used in Story of my life by one direction and what are each of their purposes?

In "Story of My Life" by One Direction, the primary instruments include acoustic guitar, piano, and strings. The acoustic guitar provides a rhythmic foundation and adds a warm, intimate feel to the song. The piano enhances the emotional depth, creating a melodic backdrop that supports the vocal harmonies. The strings contribute to the song's soaring dynamics, elevating the overall atmosphere and adding a cinematic quality to the arrangement.