Can't use plugins when running on OSX

I can't use any plugins so far when I deploy on OSX. I have tried cordova-plugin-file, cordova-plugin-camera and cordova-plugin-bluetoothle.

In each case, it works fine on Android, but fails on OSX with a message like "10/02/2017 15:03:28.056 HelloWorld[15580]: ERROR: Plugin 'File' not found, or is not a CDVPlugin. Check your plugin mapping in config.xml."

I'm using the command line. I have tried removing all the platforms and adding them again. I am running with "cordova run osx".

I'm not sure what version of cordova I have - I installed using 'npm install -g cordova'. 'cordova version' reports 6.5.0, but that version does not seem to exist in the dropdown above.