Is anyone familiar with XVASynth?

[N.Gamma]

I have created csv files with dialog lines in them using the Fallout 4 Batch Prep plugin in XVASynth.
I wanted to drag and drop these files into the Batch Synthesis window of XVASynth, but the csv files cannot be dragged and dropped into the window. No error message appears, only my mouse cursor turns into a red circle with a dash.
Does anyone know what the problem is and how I can fix it?