In this case it's a good idea to try re-adding the files in Spotify while being offline. If the issue persists, it could be that there is an issue when Spotify is trying to match the metadata of the file with our data bases. As a workaround we would recommend that you try changing the titles slightly.
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I actually think that might be the case with the apostrophes. However, some of my files have apostrophes and still work with pictures. But in the last update, people complained about local files not showing up with special characters, some of mine didn't show up but others did with the exact same characters in them. I think this is the issue, however this has been going on for much longer for me.