The official description
AARO assesses that this video, whose uploader-defined title is “Spherical UAP [CALLSIGN] 2021/04/12 vid 0,” is likely derived from a full-motion video camera and an infrared sensor aboard a U.S. military platform operating within the United States Central Command area of responsibility in 2021. Video Duration: 00:04:46 Video Description: 03:02-04:00: An area of contrast enters the sensor field-of-view from the upper right corner of the frame, exiting in the bottom right corner of the screen. The sensor pans to track the area of contrast, centering it within the sensor field-of-view. 04:01-04:46: The sensor changes modes as the area of contrast becomes indistinct against the background.
Quoted from the U.S. Department of War, PURSUE UAP releases. Read every file for this incident in Official files or at war.gov/UFO.