I am using a Lumia 950 XL. I actually have had this problem on multiple phones. Is there a way to get Groove music to actually show all ones music on the SD card. Groove music will show most of the music, but it will not always show all of it. After a week, I am pretty sure it is not going to show them. My music files are fine. In fact I went and renamed one of the files slightly and it showed right up. I do not want to go in and rename all my files. I just do not understand how Microsoft can be so bad with music apps. I know Windows 10 is very buggy and should not be released to the public, but I have a Lumia 950 XL and am stuck with Windows 10 mobile.