Two brightly shining objects cycle up and down at night above lake

On August 27, 2021, at approximately 3:00 am I notice a bright pulsating object from my balcony where I was having a cigarette. I started filming on iPhone 8, which is not the best for recording at night. I live on the 20th floor with a great view of Ontario Lake (I attached an image of the view taken during the day of the same angle as the footage of UFOs). I have recorded about 12 videos and taken 1 photo. In almost every video, an object can be seen shining brightly above the lake. As it slowly descend, a trail of smoke can be visible over it. When it is near the water, another object lights up above the first one with the same pulsating intense light and a trail of smoke. Few seconds later the first object's light slowly go off. Then minutes later the second object does the same manoeuvre and its light goes out. There is a pause of activity for a few minutes, and then the same spectacle repeats, each time the objects seem to be travelling away from me (w! estwards). It was a windless night. I could clearly see the light bouncing off the clouds and the surface of the lake. Its shape appeared to be oval, with the left side of the craft giving off most of the light, and on its right side there were few other bright lights, but not as bright as the main light. These details are not easily distinctive on the videos, but I could see them with my own eyes. Even though I only saw 2 crafts at a time, I assume they were the same two, in all the videos.
To be honest, it looked like they were burning something off, or even cooling themselves off on some submolecular level, although they did not touch the surface of the lake.