Hello guys, this is my first smart phone and I am having some new I issues. I was told to buy an SD card so I did. When I go to the storage I see the card and it shows me how much space I have available but when I changed the storage place for pictured it says that I have no external storage. I don't know ho to tell what class of SD card I bought nor what class is supported by my phone. Please help me I don't want to lose my photos.