I have a Note 4 and was transferring a video from the Note 4 to my PC using file transfer with USB. In a matter of moments, the video disappeared and was not found on my PC or the Note 4 internal memory. No error messages either. The video was shot in UHD and was over 3 GB. I should've played the video on the Note 4 to see if it came out alright but didn't. I can't root with Marshmallow and I've tried using a 3rd party program to retrieve it, but nothing shows up. The Samsung video recorder uses internal memory, right? I've checked the SD card and it's not there. I'm SOL unless somebody can help. Thanks.