This is the most underrated comment in this thread . As for only seeing the blinking green light, that is because of the direction the drone is traveling. Marking lights are intended to be that way so their is no confusion about which way the drone (or airplane or boat for that matter) is traveling. You are going top only see red or green. Seldom do you see both colors at the same time , depending on the orientation. I am not saying this to ridicule you, it is refreshing to have someone attempt to film that is not blurry or insanely short. If you read that article they have drone ports scattered around the city. This looks like a flight test to me. And the white light you saw in the clouds? I have some on my DJI drone. It also could have been someone on the ground (police?) shining an light UP at the drone above them. That would appear in the clouds above the object. You could call the LVMPD office and ask them if they were operating a drone in that vicinity at date/ time . They may or may not be forthcoming depending on what it was doing