But if you have zero confirmations, then you are likely doing something wrong. You might have to wait a day to see that you have some uploaded records. I think on average many folks see something like 25% matches. Maybe the time you have for the QSO is wrong. Many folks are using UTC time. If the time is wrong by more than 30 minutes then it does not match. Or maybe the day does not match...Or the mode...or the frequency band...etc Lots of people use LoTW. Especially those who are interested in ARRL sponsored awards like DXCC, WAS, VUCC.