After much tinkering & retrying, I was not successful at getting a voice over added to the Week 10 video file.
I don’t know what the problem was, but it definitely had to do with the video files. I tested making voice overs for other videos and they worked just like normal. Then when I tried to add just an audio music track to the Week 10, even it was silent! It totally leaves me baffled, but I had to move on.
So with out further ado, here is Week 10 of Project Life 2017: