jquery ui function not available. What am I missing here?

jquery ui function not available. What am I missing here?

Hi.

I want to use draggable. JQuery ui file was created with "download builder" and Interactions: "toggle all" selected.

Files included on my index.html like this:
<script src="assets/js/jquery-3.1.1.min.js"></script>
<script src="assets/js/jquery-ui.min.js"></script>
<script src="assets/js/app.js"></script>
In app.js I have:
(function($) {
$(document).foundation();

$( ".song-dragger" ).draggable({ axis: "y" });

})(jQuery);
In my /js/ folder I have:



In console I get error:
Uncaught TypeError: $(...).draggable is not a function

How can this be?
Thank you for your help.