My staff are clocking in on the POS but not showing up in Loaded, why?

This is almost always because the staff member hasn't been linked between Loaded and your POS. Go to Time → Manage → Staff Members, find them, and check the POS Staff Member field. If it says Not linked, click More next to their name and select the right POS staff member on the Basic tab. If they're missing from that list entirely, they may be linked to a deleted employee on the POS side; tick Show deleted employees, set that old link to Not Set, then relink them properly.