I had Music Videos in .mp4 format stored inside my Dropbox Account. I've exported them to my phone and stored them to my external sd card. However, by doing this, it created doubles of a music video. I've had 12 music videos and in the end I have 24 music videos in a similar file inside my SD card. I tried deleting the other "Music Video" file. However, after doing this, the original "Music Video" file isn't playable anymore. Does anyone have a fix for this? I hope my scenario made sense to anyone reading this! Thank you for all your help!