That's right but I'm afraid there's no faster way. The training does not get uploaded because the app does not go back into history more than 3 months :-)
If you browse the month manually in training log, you should however be able to upload it.
By now it's only possible to scroll trough the training log month by month.
I had a problem with my mobile while starting a training, when it lost the real date and was set to default January 1st 1970. I did not want to spend the time to set the correct date/time again, because I expected to be able to change it easily afterwards in the gps-spots portal.
Unfortunately this training is not uploaded by the upload function. So I tried to find it in the trainig log. And this took a loooooong while to get to January 1970...