Having a (moderately) popular YouTube channel, I was looking forward to uploading in 4K 60FPS when I got my hands on the iPhone X. However, when trying it out last weekend, I couldn't help but notice that the image stabilisation is almost non existent? I tried a couple of test videos with 1080p 60fps and things seemed as they were with my 7 Plus, so it seems to be purely a 4K issue, rather than a hardware fault. Also, it doesn't seem as smooth as 1080p60. Is there a hidden setting or is this just a feature of 4K60? I've watched a few YouTube videos shot in 4K60 on the X, and they seem a lot better than what I have. I also tried 4K24, and that looked awful - almost unwatchable. Viewing on a 5K iMac bought in Jan 2017, so not sure it would be a hardware issue there. My only other thought is could it be an iMovie on MacOS issue? Although viewing the raw files in Quicktime don't seem to look any better.