So a lot of people are trying to dissect this now, and trying to show that it's a false flag attack. ... Ugh.
So first thing is that people are sharing about there being "muzzle flash" on the fourth floor even though the shooter was on the 32nd floor. This "muzzle flash" was still going long after the shooting had stopped. It's not related.
Another thing is apparently a Hispanic lady was warning people nearly an hour before the attack. My guess is that she accidentally saw one of the guns before the incident. Either in the hallway, or maybe she was a cleaning lady at the hotel who saw the guns while cleaning the room.