Hi,
Your website uses a template which include jQuery, like some other components in your website:
<script type="text/javascript" src="
code.jquery.com/jquery-latest.pack.js
"></script>
The problem comes from that, this inclusions re-define jQuery which have the effect to remove "jQueryUI" loaded by HikaMarket.
In the page, you can see a javascript error:
Uncaught TypeError: Object [object Object] has no method 'sortable'
"Sortable" is a feature from jQueryUI.
The other components (HikaShop and modalizer) have a special version of jQuery which allow them to not break jQuery if it is already defined.
Because there is a javascript error in the page, the HikaMarket script is not processed, that's why the upload manger is not initialized correctly.
You can see it because you can see the html upload zone just below (the button "Elegir archivos").
The component "jQuery easy" could help you to fix the jQuery inclusions by making just one.
extensions.joomla.org/extensions/core-en...jquery-scripts/18327
Regards,