If you can't find something you're looking for on the Spotify app, then it's likely that it's not been made available in your country yet - check out this article to find out more about the reasons for this.
If you own music files which you would like to add to your collection on Spotify, then you can totally do this. The steps to add these files (known as local files) to Spotify are outlined in this article.
If you have any further questions about local files, let us know - we're here to help.
If, on the other hand, you are an artist who wants to make their music available on Spotify, make sure to head over here.
Thanks! Stay awesome :)