Can someone give me a complete, from the very beggining to end guide to moving downloaded mp4 movies from my internal memory on to my SD card? Everytime I use the "my files" stock app to move or copy the movies, the files move properly BUT when I go to play the movies I get a "sorry this file cannot be played" message. I bought a new Samsung class 10 64 GB card, threw it right in and this is where I'm at. All I want to do is move the movie files from my internal memory to my sd card. Please give a step by step guide because whatever I'm doing isn't working. I've tried doing this on the phone, on the computer, using 3rd party apps like es, b2 etc and I've also tried different players like MX. Please help!!