How would controller interact with uploader?

I need to update some standard and custom fields upon upload of a chatter feed file on a VF page in a public site. I need to pass URL parameters into some of these fields. If I add custom controllers to the VF page and I use Skuid:page to display a Skuid page with an upload component and I use it to upload a chatter feed file, would controllers in the VF page recognize that I uploaded a file, pull in the URL parameters and add them to the standard and custom fields of the Files ContentVersion? I’m wondering if the Skuid upload component would bypass the custom controllers on the VF page.