Having a bit of weirdness on my 6S Plus... If I message someone (like a fellow 6S user) one of my 4K videos, it only sends as 720. Likewise if I try to post one of my 4K videos to YouTube using the Share Panel, connected to WiFi, HD option (it gives me the option for standard def or HD), the video only ends up in YouTube as 720. Finally, if I share the video via email, it only sends as 720. Any hints on how to share 4K video as 4K? I know folks are doing it to YouTube since I've seen the videos there!