Send custom data with dropzone.js on each File Upload

Question

I am using dropzone in my Code Igniter Project.

With every drag of a file, dropzone creates an ajax request and my files is getting stored on the server too. But now

Answer 1

Abhinav has the right and working answer I only want to give a second option to use it in the options object (for example if you have multiple Dropzone sections on one page.)

myDropzone.options.dropzoneDivID = {
    sending: function(file, xhr, formData){
        formData.append('userName', 'Bob');
    }
};