Make sure to include following js files at end of body element

                                                    
                                                        <!-- plugin js -->
                                                        <script src="assets/js/vendor/dropzone.min.js"></script>
                                                        <!-- init js -->
                                                        <script src="assets/js/ui/component.fileupload.js"></script>
                                                    
                                                

                                                    
                                                        <!-- File Upload -->
                                                        <form action="/" method="post" class="dropzone" id="myAwesomeDropzone" data-plugin="dropzone" data-previews-container="#file-previews"
                                                            data-upload-preview-template="#uploadPreviewTemplate">
                                                            <div class="fallback">
                                                                <input name="file" type="file" multiple />
                                                            </div>
                                                        
                                                            <div class="dz-message needsclick">
                                                                <i class="h1 text-muted dripicons-cloud-upload"></i>
                                                                <h3>Drop files here or click to upload.</h3>
                                                                <span class="text-muted font-13">(This is just a demo dropzone. Selected files are
                                                                    <strong>not</strong> actually uploaded.)</span>
                                                            </div>
                                                        </form>
                                                        
                                                        <!-- Preview -->
                                                        <div class="dropzone-previews mt-3" id="file-previews"></div>

                                                        <!-- file preview template -->
                                                        <div class="d-none" id="uploadPreviewTemplate">
                                                            <div class="card mt-1 mb-0 shadow-none border">
                                                                <div class="p-2">
                                                                    <div class="row align-items-center">
                                                                        <div class="col-auto">
                                                                            <img data-dz-thumbnail src="#" class="avatar-sm rounded bg-light" alt="">
                                                                        </div>
                                                                        <div class="col pl-0">
                                                                            <a href="javascript:void(0);" class="text-muted font-weight-bold" data-dz-name></a>
                                                                            <p class="mb-0" data-dz-size></p>
                                                                        </div>
                                                                        <div class="col-auto">
                                                                            <!-- Button -->
                                                                            <a href="" class="btn btn-link btn-lg text-muted" data-dz-remove>
                                                                                <i class="dripicons-cross"></i>
                                                                            </a>
                                                                        </div>
                                                                    </div>
                                                                </div>
                                                            </div>
                                                        </div>