File upload from Appgyver

Getting closer…

Getting error:
{“code”:8002,“message”:"Could not parse request with message: Missing boundary header, status code 400](File Uploading error. {"code":8002,"message":"Could not parse request with message: Missing boundary header, status code 400)

Which I see another post on this and your response, but I still dont understand what needs to change.

My REST call looks like this:
https://api.backendless.com/'app id’/‘rest api’/files/web/images/image.jpg?overwrite=true

and I’m passing it {fileURL: pageVars.imageUpload} where the imageUpload is a path (file:///var/mobile/containers/etc/etc) to the image file.

How close am I?