I have exactly the same problem. My 5 Plus won't read any files on the card except the pre installed ones from Creality and 1 that I loaded 2 days ago. The only additions it reads are files sliced in the Ceality slicer, which unfortunately does not list the 5 Plus. I don't know how to change profiles in creality slicer for the differences of the 5 plus e.g. bed size. Any advice from Creality or other experienced users would be appreciated