The machine says there are no files
This is almost always the folder, and it is not your fault. Many machines read designs from one folder only and ignore the rest of the drive. They do not report that as an error. They report it as an empty list.
Open Designs on the dongle and check the design is listed. If it is not there, upload it again.
Open Setup and check the machine setting. The machine setting decides which folder the dongle files designs into. A wrong machine here points the dongle at the wrong folder, and everything else looks normal.
On the machine, leave the design list and open it again.