Thanks for searching for the answer you need here!
As @landonharris88 mentioned, a clean reinstall is recommended instead of the regular reinstall. We suggest this step as it'll remove the old drivers first and then install the new ones. It'll also get you the latest version of Spotify. Then you can try syncing the local files again.
Always make sure the two devices are connected to the same network when working with local files.
Hope this helps. Keep us posted.
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“Music is the strongest form of magic.” Marilyn Manson
I managed to get the ONE track I have locally - I own the album it came from - to play on my iPhone 11 while they're connected to each other but I still can't download that track. There's no green arrow beside that song :C
Super frustrating because it's my favourite sprinting track AND it used to work until a year or so ago.