As of this morning, I am unable to import PCF components into a Canvas PowerApp. I was attempting to add @yashag2255 's (I think) Export to Excel PCF component to an existing PowerApp, and it fails without an error message. I get a loading screen, and sometimes a message that it may take a few minutes, but no error, and the component never becomes available.
I tested this in a new, otherwise empty PowerApp, and received the same result. I also tried to add other PCF Components.
In fact, in an app where the component is installed and working, it does not appear in the Components list anymore, and I can not add it to a new screen, although I can copy and paste the existing button.