Problems with selecting music – Chord Tracker - US Review

I don’t know what the problem is but it says “this data cannot be selected”. I’ve heard a lot of people praise this app but it seems that this app does not work with iOS. I have Apple Music so I do not know what the problem is. I hope to hear back from the developer and let me know if there’s anything that can be done about this problem.
Review by Music11991999 on Chord Tracker - US.