Any error message when you try to oepn that video on your phone? Should it be possible that the format is not supported by the video player on your phone?
Can you tell me the format of the videos? And did the video transfer successfully?
It says "failed to open file". I use iMovie on my Mac to edit the videos. The files are in MOV and would sucessfuly transfer and i could open them in my gallery before. The videos transfer fully now, but i cannot open them in my gallery, which is the default application in my settings where my downloaded videos will show up. I also use MP4 format sometimes to see if it would open after i transfer, but MP4 won't open either.