So I used mic-recorder-to-mp3 to do a web that records user's audio to mp3.
Then I tried OneDrive API, which was too complicated for me. I managed some progress but too little to be useful at this point. Perhaps next time, when I'm free.
It's easier to just have the blob buffer uploaded to the web server:
Great source: https://stackoverflow.com/questions/27220859/record-audio-from-user-and-save-to-server
This is a good project. I've saved it on nygc.edu/PlacementTest. I just need to back it up.