Just received new galaxy s7 and have a 128gb sd card (samsung brand, one of the better ones after research). I can move files to the card on the phone and it generally seems to be working. HOWEVER when I received a picture in a text message and try to "save to phone", it won't let me download and says "Failed- SD card unavailable". I tried formatting the sd card. Removing/replacing it physically, but no improvement. It otherwise seems to be working appropriately and is mounted. I'm at a loss what what to do, this is really annoying as I can't download to the card it seems. Any ideas???