I heard this story almost 5 months ago but could never find any audio! Today is the DAY!!!! Fifth Harmony's Camila Cabello was originally supposed to be the vocalist on the HUGE track by The Chainsmokers! Checkout the demo below. Apparently she would not have been able to travel in support of the song due to her obligations with Fifth Harmony. That's when Alex and Drew had Halsey go in the studio and cut the vocals we are all familiar hearing on the radio! Just wish we could have heard the final track with Camila!