Checking events. Saw a camera had an event that usually does not at this time of night. Nice dust particle. Wish it was a little lower.
I think that may have been an insect walking around the lens. I had one do that on my back deck camera.
I’m going to say that was a spider or some other bug. I get them often on my external IP cams.
Insects are attracted to the four IR lights around the camera lens.
Don’t tell my wife that was a bug. She does not like bugs in the house. Especially in the winter.