In my Angular app, I have a parent component with two child components. I want to share an observable, call it newUploadStarted$, created in the parent component that the two child components and communicate on. The two child components are multiple instances of the same component that, if clicked, trigger a file upload. I want to raise an event on newUploadStarted$ in the child component such that all child events react to it by clearing old messages they might have. export class ReportUploaderComponent implements OnInit { @Input() newUploadStarted$: Observable<1>; ... onChooseBlueReportFile(files: FileList) { newUploadStarted$.raiseEvent(1); // Specific number isn't as important as letting the child raise the event on something it did not create. } To me, this should be something very simple to do, but I'm just not seeing an example of this in a way that makes sense to me. What am I missing? Continue reading...