Ok I am getting really frusturated and would appreciate any help I can get.

I have about 10 songs that I have downloaded from the internet because they are nowhere either on Spotify or iTunes or a bunch of other services. I have them all in my iTunes folder in my mac, and I have added them to a playlist on my Mac desktop Spotify application through local files. I am trying to sync them with my iPhone and nothing is working. I really do not know what to do.

Before anyone asks:

-Yes, I am on the same wifi network.

-Yes, I have uninstalled and reinstalled the application on both my iPhone and Mac.

-Yes, my firewall allows Spotify through.

-Yes, all the songs are in Mp3 format.

Any ideas?