blinking object seen racing around in sky

On the weekend of September 30- Oct 1 my wife ((deleted)) and I spent the weekend in historic Gettysburg, Pa, celebrating our 38th wedding anniversary. On the evening of September 30th 2023, at around 9 pm we were taking a guided walking ghost tour of the town. The tour guide had us stop at a few locations while he told his stories. On the last stop, the guide was standing on a side street and our group was either sitting or standing listening to him. My wife was sitting down on the curb and looking up at the guide who was doing his thing. She became distracted by a blinking object behind him in the sky- which was moving at a very fast rate of speed. She said it zigzagged- back and forth- and then pulsed left/ right, left/ right- before it moved across the sky at a constant speed. That was the part I caught very briefly on video from my I phone. I lost it in the tree cover in the parking lot after a few seconds.
I also have 2 photos which I took before the video. It is difficult to see the object on the still shots unless you blow it up. It is near the center in both photos. When increased in size, it appears to be somewhat disc shaped with a reddish haze around it. There are a couple of other strange areas on the photos which may have something to do with the camera on my phone. We don't recall seeing those with our eyes, but they are interesting. If you increase the size of the still shots you can see lines under the lower clouds which do not appear to be clouds. Also a couple of bike handlebar( for lack of a better description) shaped objects higher up in the one photo.
There's probably a logical explanation for all of this, but we don't know what that is. We thought maybe the blinking object was a drone, but after talking to one of our sons- who happens to be an aerospace engineer- he said they don’t move like what we described to him. The weird thing was that no one else in our group noticed this. We also looked online to see if anything was posted about this in that area, but came up with nothing.
We are looking forward to have someone give us their expert opinion on this!
Thank you