I didn't use smart switch to transfer files. I just need a few videos converted to my camera roll so I can make a video for my business as the app I'm using needs the video from my camera rollThey don't play? If you used Smart Switch to transfer, AFAIK they should have converted automatically. If not, you can always download VLC or KMPlayer or MXPlayer from the Play Store. They usually play more formats than the default video app.