I have discovered that after a while, the app itself recognized the tracks 'unable to be added to the Playlist' and it does it automatically. My tracks were on the Playlist indicated once I open the app and wait a while. Something is going on, but if it just take time, I can 'accept' it.
Sorry to say I am also experiencing the error. Unable to add track to the Playlist. Does not matter what Playlist is selected.
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