You need to do that only if you’re using custom font. On Interior demo we use Woodford Bourne. It’s custom font and it’s not available on import content so you need to download and upload into Custom Font option.
For the FontAwesome, it’s a font icon https://fontawesome.com/. You’re right before, on Interior demo we use Woodford Bourne. May i know if you already get the Woodford Bourne font file or not?