The customized files will not be zipped back to the template archive automatically. It you want to transfer or share your template, you need to zip the template files back to a template archive yourself. When you zip the template files, make sure you zip the files and subfolders in the unzipped folder, not the unzipped folder itself. Otherwise there will be one level different. Using above example, you should add the files and subfolders under \Templatesdefault.zip to the template archive, NOT the whole folder.