Multiple SSL certificates via one listener

Me and my best friend have been bumbling around on OLS installed on Ubuntu server 20.04. We've got the pretty forwarding setup, we've been able to access multiple sites. Then we installed one SSL certificate from an authority and that's seeking like the only certificate the entire server wants to use for all sites tutuapp. I've no idea what's going on and could seriously use some help please. Thank you guys in advance, and hopefully this can act as documentation for someone else later on.
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