In sky dogging in and out of clouds in a swooping motion

Night after a full moon eclipse, sky was grey and stormy looking. From 23rd level of a condo building I casually looked out to see a white light just below a low dark cloud. Initially I thought was an airplane. From my condo I see all the airplanes flying straight towards me far off in the distance then take a few seconds to turn direction and begin circling over Toronto before landing at Pearson Airport -at which point you see the other flashing lights on the plane- but I realized this white light wasn't glowing like a light, it was just the colour white in contrast with the dark grey clouds. From the moment I saw it, it was flying down diagonally to the right, I blinked and it swooped diagonally up to the left super fast up into the low cloud. It swooped like a seagull or kite would.
I waited several seconds before it reappeared by coming back down out of the cloud quite a distance away (I confirmed no flapping or any drone movements, and definitely way too high in the sky for kite and impossible too since it's over apartment buildings and roads etc.) did about 2 more swoops down and then back into the clouds. Didn't see it after that. The sighting took place in about 20 seconds.
I took a photo of the sky and I've drawn lines to mimic the movements