I just recently added several songs to my iPhone 6 Plus. Here is what I did:
- Add songs to my playlist in iTunes in my MacBook Air.
- Sync music to my iPhone 6 Plus
When my phone is playing the recently added song, it does not finish. If the new song is 3 mins long, when it is somewhere on the middle, it will play the next track, but the display on my phone is still the same (the recently added song).