It looks like his vocals are still in Piapro and thus won't show up as a waveform. My suggestion is to export the vocals as a .wav file from Piapro so you can align them more easily, or if you don't want to export, let me ask: does the tempo/BPM in Studio One match the tempo inside Piapro Studio? If they don't match, you'll need to make sure to change the tempo in Studio One to be the same as the VSQx you're using in Piapro Studio.
Hope this helps!