Gif: "Confused about exporting from PS CC."

I've made the .gif fine, but I want to upload this to instagram and I can't do that unless it is a .mp4 or a movie file.The exported .gif looks great, but when I try to export/render in PS as .mp4, it lasts 1 second, and has a black screen at the end!Does anyone know what I'm doing wrong? via /r/Cinemagraphs https://www.reddit.com/r/Cinemagraphs/comments/5twq67/confused_about_exporting_from_ps_cc/?utm_source=ifttt