Round glowing object, changing size and brightness, then dropped out of sight.

My son was talking to me when he saw an object in the sky and said “What is that?” I turned to look, and we both picked up our phones and went to the balcony. We both took videos, his phone is better than mine, but we got 2 videos. It was circular and orange/red. It got larger and smaller and the brightness changed. It hung in the air before lowering and disappearing. It shot sideways and back before it disappeared. I didn’t want to put on social media and did not know where to report this. There was also some sort of mechanism on the bottom. It appeared to be very far away.