I have come along an issue I am quite perplexed. I got two factory reset phones, One X and One X+. I send over bluetooth the same exact video file, a 2Mb .avi sent over whatsapp to a third device. The One X receives the file and it appears under All Downloads in the Gallery with its correct thumbnail and opens with no problem at all. The One X+ is unable to assign a thumbnail or open the video at all. Any ideas of how is this even possible? I believe I can solve the issue with a third party app, but gallery is where I always go first for videos or photos and it is quite annoying to not be able to see what I want to select. Any ideas or help?