So far I've had bad luck trying to play videos on my DI. I didn't spend a lot of time looking into what it takes to play videos but I assumed it would be pretty straight forward and "drag 'n' drop." I've loaded a .mp4, .avi, and a .mkv. So far, none of them work. I didn't try them all at the same time (mostly because each time I just threw the video on there, assumed it would work, then found out later it didn't) so they have all been different videos, thus shouldn't be corrupted files. What do I need to do to get them to play?