I recently went to Disney world and recorded a bunch of videos. I wanted to show my family those videos on the computer. So I plugged my phone in. Selected USB mode and then clicked on its video file. When I played a video the sound would not work, but the video itself was perfectly fine. The sound plays on my phone when I take it off, and my speakers work when I play something that was already on my computer or online...So whats the problem? Why isn't it working?