Just on a hunch:
You say that on your desktop PC or laptop, "there is nothing in the file folders". Do you see the same folders on the USB drive when browsing in Windows, as you see when you have the USB drive plugged into the Linux-based control?
Did you tell it to put the Report files in a subdirectory (folder), or at the top level (a:\)?
The file you are looking for is report.zip.