My mp3 player. my mp3 player will not let me play mp3s nor photos and it has the ability to do so

Question

my mp3 player will not let me play mp3s nor photos and it has the ability to do so it either says format error or it lets out a shrill sound that is ear piercing..... and i need to figure out how to get the mp3s to either format or to be on the mp3 player to where itll play them correctly.... thanks for your help