After uploading the product, if no error files are generated still the product is not visible on Jet and no files are generated in the Jet Partner Panel > API > File Uploads section then that means the product has been successfully uploaded on Jet. If is it not getting listed then that is an issue of Jet as sometimes the products get stored in their backend but never get listed due to some internal issue of Jet. In this case, the Jet support Team should be contacted.