Dropbox API: Sending Data Via Ajax to Controller

I am using the Dropbox API JavaScript Chooser and want to return the data from the response into my Controller

The Javascript Options for the Dropbox API

options = {
    success: function (files) {
        $.ajax({
            url: '/FileTransfer/FileData',
            type: "POST",
            dataType: "json",
            //data: JSON.stringify(files[0]),
            data: files,
            success: function (result) {}
        });
    },
    cancel: function () {},
    linkType: "preview", 
    multiselect: true
};

Controller Action

My controller action currently doesn't do anything at the moment but will eventually cache the output data into a model once i can get data to be passed into it, which is hence my problem.

    public JsonResult FileData(string model)
    {
        return Json(new { success = true });
    }

Refactored code following suggestion

Javascript

options = {
    success: function (files) {
        $.ajax({
            url: '/FileTransfer/FileData',
            type: "POST",
            dataType: "json",
            data: { result : files},
            success: function (result) {
                $("#FileList").load('/FileTransfer/Cloud');
            },
            error : function (jQXHR, textStatus, errorThrown) { }
            });
        },
        cancel: function () {
    },

    linkType: "preview", 
    multiselect: true 
};

Controller

public JsonResult FileData(List<DropboxFile> result)
{
    CacheEntity(result);

    return Json(new { success = true });
}