Flights not appearing on FA

Hi there! I have been flying around my local airport for about a month, flying at altitudes highest of 5,500ft. My flights have not once appeared on FA until today when I climbed to 8,500ft (very rare occurrence in a Cessna 140). Why am I and many other aircraft at my regional airport not appearing on FA below ~6,000 MSL?

Did you file a flight plan?

You need to enable position only flights if you don’t files a flight plan.

Do the aircraft have ads-b or mode s transponders?