Migos member Quavo has been cited in the weekend brawl after performing in Las Vegas, and we're told it was the video evidence that allowed cops to charge the rapper.

According to cops, Quavo and three other people were cited for battery against two hotel employees at the Encore Hotel & Casino.

Police say they viewed the security footage and clearly saw Quavo involved in the melee. We're told there was no doubt that he got physical, and was issued the citation for battery.

The Blast broke the story about the fight that went down Sunday morning after a hotel valet asked Quavo to move his car. As we reported, Cardi B was also present and had to be rushed to safety when the fists started flying.

The incident went down after Migos and Cardi B performed at Drai's nightclub.