Hi, I finished my ride and saved it like how I usually do, but this time around it didn’t upload to Xert, is the data lost? 
Unfortunately yes. This is a known problem. Update should be coming out shortly to address this. If you successfully completed the workout, you can drag-and-drop the workout onto the calendar and it will use the XSS and Focus scores calculated from the target power values. You can then tweak them if needed.