Change Dropzone maxFiles Dynamically

I'm trying to dynamically update the MaxFiles property each time a new image is uploaded/deleted. By using the following code its not allowing any image to upload instead of limitize it to maxFiles. And it is not taking the value of the variable maxFile, but when i remove maxFile variable And put a number then it works fine. got source code idea from this Answer.

!function ($) {
"use strict";
var Onyx = Onyx || {};


Onyx = {
    init: function() {
        var self = this,
            obj;

        for (obj in self) {
            if ( self.hasOwnProperty(obj)) {
                var _method =  self[obj];
                if ( _method.selector !== undefined && _method.init !== undefined ) {
                    if ( $(_method.selector).length > 0 ) {
                        _method.init();
                    }
                }
            }
        }
    },

    userFilesDropzone: {
        selector: 'form.dropzone',
        init: function() {
            var base = this,
                container = $(base.selector);

            base.initFileUploader(base, 'form.dropzone');
        },
        initFileUploader: function(base, target) {

            var maxFile = $('.dropzone').attr('data-count');

            var onyxDropzone = new Dropzone(target, {
                url: ($(target).attr("action")) ? $(target).attr("action") : "data.php", // Check that our form has an action attr and if not, set one here
                maxFiles: maxFile, 
                maxFilesize: 5,
                acceptedFiles: ".JPG,.PNG,.JPEG",
            //  previewTemplate: previewTemplate,
            //  previewsContainer: "#previews",
                clickable: true,
                uploadMultiple: false,

            });

            onyxDropzone.on("success", function(file, response) {
                let parsedResponse = JSON.parse(response);
                file.upload_ticket = parsedResponse.file_link;
                var imagecount = $('.dropzone').attr('data-count');
                    imagecount = imagecount - 1;
                    $('.dropzone').attr('data-count', imagecount);
            });
        },
    }
  }
}// JavaScript Document

function openImagePopup(id = null) {
   $(".upload-images").show();
    $.ajax({
        url: 'fetch.php',
        type: 'post',
        data: {id: id},
        dataType: 'json',
        success:function(response) {
            var imagecount = response.counts;
            $('.dropzone').attr('data-count', imagecount);
    }
 });
}  

HTML

<form action="data.php" class="dropzone files-container" data-count="">
   <div class="fallback">
       <input name="file" type="file" multiple />
   </div>
   <input type="hidden" id="imageId" name="imageId">
</form>

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