So not sure if this is known, but I found an issue with apostrophes when you have a device using local lyrics joining a session. I know the title has to be exactly the same to link, and usually that works fine, but any time there is an apostrophe in the title, it fails to link the files.
For instance, for the song “Don’t Dream It’s Over,” it won’t link (note, I tried changing both to just “Don’t” to make sure I didn’t have a typo; still didn’t work). But if you change to Dont Dream Its Over, it links fine. Not a big deal but was a headache for a few minutes.