Reflective sphere that morphs to looking like a square moving accross a mountian ridge then dips into a valley blending into the trees

Sitting on the back porch 2:48 pm on 8/13/2022 looking SE over a valley just north of Gulpha Gorge Hot Springs National Park. I saw a reflective object out of the corner of my eye from the north descend down out then slightly correct it's flight path moving from north to SE across a mountain ridge. I then was able to get my cell phone out and start recording the object move across the mountain ridge, it then started a descent into the valley below. The object at first was pronounced spherical reflective then would morph into a black looking square. Never any bright lights, more or less like reflecting the sun light back. As it moved into the valley it began to lose it's shape and became more a reflective light atop the trees almost as if it was able to conceal it's shape once looking at the object from above. We then lost the object as it moved into the valley below and was obstructed by the trees. It was moving towards the town of Hot Springs.  
Balloon?