The pictures have been taken with an iPhone 5S and transferred to my PC as JPEG files. I open them with Photo Pad, crop and/or adjust the lighting and save as JPEG. The GPS field of the metadata of the original picture has three lines; longitude, latitude and altitude. I do a "save as" jpeg and modify the file name. The edited file only contains one line in the GPS field which is altitude.
I should note that I am using a Dell laptop with a Windows 10 operating system.