Sound not working

I am using Harmony 14 essentials on a Windows 10 device (a surface pro 4 if that makes any difference) and I am trying to add a .mp3 sound, but it doesn’t play the sound, and no waveform is shown on the Xsheet or timeline view.
Any advice?

WOW thanks so much for the advice that has helped me greatly. it seems to be working now. I just bought the program today. thank you thank you.

I think you need instill quick time player. I use mac so it come with quick time player. hope its helps.