You just stated that you MOVE the music fils from internal to expanded (external) SD Card storage. Whatever tool you're using to view files is probably showing the same files in the new location. Selecting and deleting them is likely deleting them from the NEW LOCATION.I am using Galaxy J3; when I download music, it saves on internal data drive. I am moving this music to a micro SD card. Once it has been moved; if I go to delete from the internal drive, it also deletes it from the SD card. Why