What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
privacy data omitted Had launched normally and successfully delivered package at drop point. During the return portion of the flight privacy data omitted self-commanded an urgent land command, transitioned from forward flight back into vtol and descended toward the ground. At about 15 meters above the ground the aircraft yawed excessively during final landing maneuvers and appeared to be rolling over. A flight termination command was initiated by a safety observer. Aircraft impacted ground upside down with substantual damage to the aircraft.
Review of collected flight data revealed a (30053) ropulsion_system_motor_rear_ right_warning had been generated when the #1 motor (rear right) electronic speed control lost DC power input.
As the FAA filed it
^PRIVACY DATA OMITTED^ HAD LAUNCHED NORMALLY AND SUCCESSFULLY DELIVERED PACKAGE AT DROP POINT. DURING THE RETURN PORTION OF THE FLIGHT ^PRIVACY DATA OMITTED^ SELF-COMMANDED AN URGENT LAND COMMAND, TRANSITIONED FROM FORWARD FLIGHT BACK INTO VTOL AND DESCENDED TOWARD THE GROUND. AT ABOUT 15 METERS ABOVE THE GROUND THE AIRCRAFT YAWED EXCESSIVELY DURING FINAL LANDING MANEUVERS AND APPEARED TO BE ROLLING OVER. A FLIGHT TERMINATION COMMAND WAS INITIATED BY A SAFETY OBSERVER. AIRCRAFT IMPACTED GROUND UPSIDE DOWN WITH SUBSTANTUAL DAMAGE TO THE AIRCRAFT.
REVIEW OF COLLECTED FLIGHT DATA REVEALED A (30053) ROPULSION_SYSTEM_MOTOR_REAR_ RIGHT_WARNING HAD BEEN GENERATED WHEN THE #1 MOTOR (REAR RIGHT) ELECTRONIC SPEED CONTROL LOST DC POWER INPUT.