Node.js server on localhost upload files to live server?

So I have an app that can post images etc within its own structure. I can post my backbone models(JSON data) to a live mongodb server with mongoose, something like this mongoose.connect(configDB.url); and all my messages in the app even from localhost are sent to a live server.

I am not sure how I can post images/files to a live server? I am using node.js with express as a server and also using these handy plugins https://github.com/blueimp/jQuery-File-Upload with the middleware https://github.com/aguidrevitch/jquery-file-upload-middleware.

I can post images to the local site directory like this

upload.configure({
    uploadDir: __dirname + '/public/img',
    uploadUrl: '/img',
    imageVersions: {
        thumbnail: {
            width: 80,
            height: 80
        }
    }
});

That is cool when my app is live, but I have several computers in the office running node locally and want to test the file upload, I just need the images to be hosted, similarly to what amazonS3 can do.

I hope I can learn something here. Thanks everyone who takes the time!