Apparently this is a common problem with After Effects. I'm using the demo version. I'd like to purchase a plan for my entire school, but I'm very concerned about whether it works or not. Currently it won't import mp4's into the Windows 10 version. The videos are from an iPhone. The code is AVC according to mediainfo. I have K-Lite plus Haali Media Splitter. Nothing works. I'd like a better option than to convert using Media Converter. Currently there's no option to downgrade. Maybe because I'm on the trial, but I'm certainly not buying anything until this is fixed.