Here is how the companion app can be useful, even if you don't have FCPX: 

The app allows you to upload any file(s) to without having to open a browser. Just use the pre installed Finder Service to send and upload files with the companion app.

  • Select any file(s) in the Finder
  • Make a right mouse click or ctrl+click -> the contextual Finder menu appears
  • Choose Service > Upload to
  • The companion app launches and is ready to upload your files

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