Tracking first install on iOS from mobile web to app is not easy.
Oplytic developed a seamless solution that works every time.
Give it a try:
Sample Link: https://emagsoffers.oplct.com/home/?op_l=1116396&clid=vmjobs-test
Another Sample Link: https://emagsoffers.oplct.com/home/?op_l=1116396&clid=vmjobs-test-2
Enjoy!