Angular elements - Issue serving react with templateUrl or styleUrls

[shorttermproject]

I am finding the blog posts and the examples very helpful!
I was using the angular-elements branch and it mostly works except for one issue:
In nx-angular-and-react/libs/ui/src/lib/greeting.component.ts if I use a file for the template or a file for the css and ng serve reactapp, the component fails to load and can't find the files.

import { Component, Input } from '@angular/core';

@Component({
  templateUrl: './greeting.component.html',
})
export class GreetingComponent {
  @Input() title: string;
}

Do you happen to know why this might happen?