Recreational / Hobbyist UAS pilot reported flying without LAANC authorization. A law enforcement officer noticed and ordered the UAS pilot to land.

Narrative

Who: myself; a hobbyist UAS operatorWhat: Mavic Air 2; flown within Class C airspace without LAANC approvalWhere: Location AWhen: Day 0; XA:00 - XG:00Why: Capturing photos and videos of an event On Day 0; from approximately XA:00 to XG:15; I operated a UAS to capture photo and video of a protest at Location A. I launched the UAS from the roof of my parked vehicle; with the sunroof open to maintain visual line of sight. This location is situated within Class C airspace.Prior to flight; I consulted the DJI Fly application to ascertain flight restrictions. The app displayed the Class C airspace as an 'Enhanced Warning Zone' (orange); indicating a 120-meter (400 feet) AGL flight ceiling and advising extra caution. Based on this information; and noting that the zone was not a 'Restricted Zone' (red; which would indicate flight was prohibited); I believed that operation was permissible as long as I remained below the specified altitude. The DJI app; which manages Remote ID and many other compliance features; did not explicitly state any requirement for LAANC authorization. I incorrectly assumed that the app would prevent takeoff in restricted airspace.During the flight; I piloted the UAS in wide circuits around the intersection where the event was occurring. The drone passed over active roadways and may have passed over individuals on the sidewalk. I was aware of one other UAS operating in the area; but at no point did the two aircraft come within visual proximity of each other.My DJI's ADS-B receiver indicated the approach of a manned aircraft at one point; with a closest point of approach of 1.5 nautical miles. Although the closest vertical separation is unknown; my UAS was operating well below the 400-foot AGL ceiling at the time. Upon this alert; I observed the UAS's position relative to the manned aircraft and initiated a descent to further increase separation.Around XB:15 ; a police officer observed my operation and requested that I land the drone; which I immediately complied with. I then departed the area. No incidents; injuries; or property damage occurred as a result of my operation; and the UAS did not interfere with the protest event or police operations.My primary errors were:- I failed to recognize that the DJI system does not automate all compliance and safety regulations; specifically regarding the requirement for LAANC authorization to operate within controlled airspace.- I flew too close to a crowd and active roadways.In the future; I will:- Always obtain proper authorization through LAANC for any flights within controlled airspace.- Maintain better separation from crowds and moving vehicles during all UAS operations.