I use a Nikon D7100 and a garmin ETREX 32x. Following this instruction, I copied the GPX file from the garmin to my computer and imported the photos in Darktable. I took a picture of the garmin showing the time and adjusted the time offset for the selected photos in Darktable. Then, I chose the GPX file that I want to apply to the photos and selected UTC as time zone (tried also Europe/Berlin without success). All that Darktable returns is 'Applied matched GPX location onto 0 images.
Am I doing something wrong? Is there a bug? Or could I try something else?