Put it first in your edit as the opening greeting, then follow it straight away with Okay Let's Go to move from the hello into the action. That order works for skits, streams and reaction videos, giving the opening a clear start before anything else happens.
關於此聲音
This is a short voice clip, about 1.8 seconds long, of Luiz calling out 'Olá pessoal!' in a loud, exaggerated, cheerful tone. It feels playful and a little ridiculous, like someone bursting into a room to announce themselves with far too much enthusiasm. The greeting lands as a silly, upbeat hello rather than a calm one.