Did you put the USB stick in the computer of left it in the uTrack?
In order to export you need to put the USB stick straight into the computer. Then you’re able to select the USB drive on the right-hand side of the export window, select the items to export on the left-hand side and hit the ‘Export’ button (don’t use export batch unless you have multiple uTracks in master-slave). uTool will sort out if an overwrite or quick export is needed.
After export is finished, stick it back in the uTrack and it loads up.