Copy (duplicate) a file in the OneDrive app
As I cannot add a comment being a starter to this forum, I would like say that I am not sure how to do it other ways, but I am good at Rest API and have done it through this earlier. Let me give you a code for that if you are interested, else give me a comment and I would delete the answer.


  COPY
  https://apis.live.net/v5.0/file.a6b2a7e8f2515e5e.A6B2A7E8F2515E5E!126
  
  Authorization: Bearer ACCESS_TOKEN
  Content-Type: application/json
  
  {
      "destination": "folder.a6b2a7e8f2515e5e.A6B2A7E8F2515E5E!114" }


Also, as you rightly said, there are forums like forums.dev.windows.com where you can ask such questions.