Mobile App playing wrong version of song

[CullinRay]

So I downloaded both Def Leppard - Pryomania and Hysteria to iTunes then added the songs to my Spotify playlist. On my desktop it plays the correct version of the song but everytime when I try to play the song on my mobile app, it plays the new terrible 2012 version. Also my mobile app can't seem to find all the songs that I added into my playlist, only just a few. 

[ErikG]

Hi.

Have you synced the local library from your desktop to your phone? Both Spotify desktop app and mobile app needs to be running for you to be able to do it.

Here's a guide on the subject:
https://support.spotify.com/using_spotify/playlists/listen-to-local-files/