I just recently bought a 64gb SanDisk Ultra class 10, UHS Speed class 1. When I try to put mp3 files on this card under music, my phone will read some of the songs and the rest of the music files will say " cannot play this file on this device" when all the files are mp3 format. Also when I take pictures or videos and save it to the card the pictures don't come up as anything but a file with a question mark and the videos it comes up as an error message and it says this file cannot be played. I had to reset my phone about two weeks ago because the OS would not display. Could it be my phone or could it be the card. When I save mp3 or pictures on my phone storage it works. I was told by a Verizon Samsung technician that if problems with my phone continue to bring my phone in. My phone works fine but it's annoying that I can't put my own music on my phone and save my pictures and videos to my sd card. Thank you for your time and I hope that their is a solution!
