update demo

docs/index.html

@@ -77,6 +77,10 @@
                 </div>
             </header>
             <div class="libs">
+                <div class="upload">
+                    Upload Files
+                    <input type="file" id="file" multiple />
+                </div>
                 <textarea class="libsInput"
                     placeholder="Other dependencies, support for js and css, multiple line breaks"
                     spellcheck="false"></textarea>