https://www.youtube.com/watch?v=3lgVPRWBJE4
Pretty good stuff on what happened at the Bellagio between 11:00 and 11:30 pretty well documented by a gal and her husband who is a retired marine with 23 years in the corp.
Quick summary at 30:00—32:00 shots fired there for sure and much more.
Shooters are the Aria as well,video avaliable.
https://www.intellihub.com/did-another-shooting-take-place-at-the-aria-resort-and-casino-the-night-of-the-massacre/