I have a heap of local files on my mac that I want to put into a spotify playlist. I think most of them would be in the spotify catalogue but some may not be. I know that sometimes spotify will use a spotify catalogue track instead of the local file if it thinks there is a match, but I don't understand the specifics of this behaviour. Can someone please explain when this will and wont happen?
Is there an attempt made to match all local files to a spotify track? Or is it only under specific circumstances?
If I then use another device, will it play the local file or the spotify track? What about downloading for offline?
Does the behaviour differ for free/premium?
Can I delete the local file and keep the spotify track in my playlists?
How can I tell which local tracks have been replaced by spotify tracks, and which havent?