iphone 4k

so i have a iphone 6 and also should buy apples beta phone i mean the iphone x since i need a new phone tho i dont like the fact that there are no bezels and i hate the notch with it

Hello so if anyone who reads this is familiar with the iphone 7 4k video and sony vegas i would really like some help. So my problem is that when i put the video into vegas the preview screen is very choppy even when i put the preview quality as low as it goes, is it a problem with my computer...