CT files and Edge 530

Apologies if this has already been answered somewhere. After creating a route on Cycle Travel I download the tcx course file to a Windows computer, then copy it into the New folder on the Edge. Looking at the route on the Edge, in the summary section it gives distance correctly but gives ascent and descent as 0 feet. This is Devon so that is not right. The elevation section shows a horizontal line. However, the climbs are shown correctly. Now I can get round this by copying the files into Garmin Connect and putting them on the Edge from there. All the data now appears correctly. But, if I want to make minor changes to the route I cannot makes them on the Garmin as a small change can have major consequences elsewhere in the route. I assume that is because although the route is copied to Garmin Connect the points are not. So to make a change it is back to CT and then all the transfer and copying of files. Has anyone else had this problem or, even better, found a solution?