I own a P3 Pro and have been making a few videos at 1080P instead of 4K as the only stable editing software i have currently is iMovie on my iphone 6 plus. So far, ive had no problems transferring 1080p footage to my iphone. What i do is i copy the videos from the SD card onto my desktop "video" folder, and i sync the videos in the folder using itunes to my iphone 6 plus. So far, there has been no problems with the transfer. WIth the release of IOS9 and updates to the iMovie app, it now supports the 3840 x 2160 resolution(4K in a sense). So today i went out and spent about 3 hours and 4 batteries getting footage at my local tourist spot. When i got home and transferred the files to my desktop folder and tried to sync to my phone, the videos don't get sync-ed! The folder can still be selected as per normal, it still shows that there are 35 videos in the folder. But when I press sync, it seems to go through the motion but does not sync the videos. I know i selected the correct 4K resolution before i recorded my video( there is a higher 4096x2160p, true 4K setting which i did not choose). I did the exact same method of transfer but somehow the videos won't transfer over. I am wondering if this is a common issue and if anyone else is facing this too. I've had some great footage today and would like to make a UHD video instead of letting the files sit in the folder. Please Help!