I purchased a 16gb micro sd for the phone. Copied files to it and inserted it into phone. When phone is connected to usb the card mounts and I can see it from the PC and copy files to it. When I try to browse the card from the phone, it is not found. I thought I had formatted it FAT32, but of I look at card properties in file explorer on the PC, it says 'File System: Generic hierarchical'. So I'm thinking perhaps it is not formatted properly. If I am to try another format, is it best to let the phone format it, or do it in a card reader on the PC first? I'm worried if I let the phone do it I may wipe my internal SD by mistake.