Yellow circular and semi-circular object bouncing up, down and sideways in a fast and non-directional motion

On September 23, 2021 at 6:45 PST I was taking pictures  of the sunset using my cell phone.  I took several still pictures standing on my front porch facing due West, 25 miles southeast of San Diego.  When I looked at the still shots I saw a "gray" spot far above the setting sun.  In the still shots, there appears to be a reddish light surrounding the "spot."  I tried to locate that spot with the naked eye but I could not see it.  However, It appeared on several pictures that I took of the sunset.  I enlarged the picture on my phone hoping to figure out what the spot was.  Enlarged, the spot took on a faded yellow tone.  It appeared to be a circular object.    Since I could not locate the spot with my naked eye, I began to take a video scanning the sky.  I located the semi-round spot frantically bouncing around, up and down and sideways in an extremely fast and non-directional motion.  I took a video of the "spot" as I tried to keep it in my lens.  The video lasted 2.17 minutes until it went out of my sight.