Thank you for the link to your web page. (I forgot you were using Wix.)
The problem is due to the gallery not being embedded directly into your web page but, instead, being loaded into an iframe.
This is a limitation of using an iframe and is noted in the '2) Using an iframe' support section here.
You can also use an iframe to embed a gallery in a different folder. Please note that this method will limit the functionality of the gallery. For example, when embedding a gallery in an iframe, the 'Expand Gallery' and 'Fotomoto Shopping Cart' buttons are disabled and the 'Back Button' will not work.
The Expand Button is displayed and functional when viewing the web page that your gallery is embedded into:
https://googledrive.com/host/0BwtcFyjGj … index.html
Ordinarily, all gallery files need to be on the same domain as the web page containing the gallery's JavaScript embedding code, otherwise the same-origin policy will prevent the gallery from being displayed.
Please see here for for information on the same-origin policy: https://developer.mozilla.org/en-US/doc … gin_policy
However, it looks like your Google Drive web space (where your gallery is hosted) is already set up to use CORS (cross-origin resource sharing) so you should hopefully be able to replace your iframe code with the following baseUrl embedding code (to embed the gallery directly into your web page and have the Expand Button displayed).
<!--START JUICEBOX EMBED-->
<script src="https://googledrive.com/host/0BwtcFyjGjQxGSWZfb3Jrbm9qWXc/jbcore/juicebox.js"></script>
<script>
new juicebox({
baseUrl: 'https://googledrive.com/host/0BwtcFyjGjQxGSWZfb3Jrbm9qWXc/',
containerId: 'juicebox-container',
galleryWidth: '100%',
galleryHeight: '600',
backgroundColor: '222222'
});
</script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->
I hope this helps.