Choose Present Now and choose A Chrome tab
It will then allow you to choose a Chrome Tab to present. You can choose an open tab (e.g. My Drive) to play videos directly from Google Drive, or if you had YouTube open. Choose the tab and click Share. It defaults to Share Audio.
You will see a message telling you that the tab is shared. Also there will be a blue rectangle on the tab you are sharing. Make sure to mute your mic while playing a video to avoid any additional background noise. Start playing the video, and it will play to participants with sound.
If you jump to a different tab, you will see the following message, and you can share that tab.
Once you are done presenting, go back to the Google Meet, and choose Stop Presenting. You can also turn off audio.