Enable upload of multiple files on mobile devices

Author: fgrsnau

ui/ui.tmpl

@@ -50,7 +50,7 @@
     <div style="display: none;" onclick="window.quitAll()" id="quitAll"><i style="display: none;" id="toast">cant reach server</i></div>
     <textarea style="display: none;" id="text-editor"></textarea>
     <div id="drop-grid"></div>
-    <input type="file" id="clickupload" style="display:none"/>
+    <input type="file" id="clickupload" multiple style="display:none"/>
 
     <h1 onclick="return titleClick(event)">.{{.Title}}</h1>