The VPJ file isn't media - it's a control file that saves edit instructions and contains pointers to the source files.
An easy way to save the edited audio once changes have been made is to drag it from the timeline to the bin (top-left of the VP window).
In the bin, right-click the audio file and Save Audio Clip As New File. It will be saved as a WAV to the MUSIC folder on your PC (unless, under OPTIONS, you have changed the path), and a (1) will be appended to the original file name.
Or you can simply do a direct EXPORT to Google Drive. 