Creating playlists

[Zagattack16]

Hello,

I have some music files on my imac desktop and i have playlists on my itunes library.

I am creating playlists on my spotify account. How can i drag these files from my desktop or my itunes playlists to my spotify playlist.

When i imported my itunes playlist to my spotify playlist, i couldnt listen to the songs and got the following message: '' the song is not available. if you have the file on your computer you can import it''

Thanks for your help