When I move files from internal storage to external storage the files don't get moved to sd card. They show on internal storage as well as external storage but when I delete it from internal storage it is removed from the sd card as well. I saw on another phone that there is an option to set up the sd card and change it to either internal or external storage. How do I get to that setting? Because although I move the files to sd card, the internal storage still stays full.