Need to associate an Image from Gallery with WooCommerce purchase

I'm a web developer stucked into an issue. I'm working for a client which sells 3 different plans on Wordpress with WooCommerce : plan 1 - visitor can upload 2 files plan 2 - visitor can upload 4 files plan 3 - visitor can upload 6 files All of these uploads can be done before the checkout step thanks to a Wordpress plugin called WooCommerce uploads & WooCommerce before upload ([login to view URL]) The encountered problem is the following : visitor can choose to upload one file, or select an image from the gallery (wordpress theme is "The Bridge"). When we upload a file from Desktop, it works, and it associate the file with the purchase. But it doesn't work when I want to select an existing Image displayed on the page. So I hooked the Woocommerce Uploads plugin, but i can't get it work : in fact, the upload is handled by "plupload" and get an <input file...> or a drag and drop. I get the good plupload Object, with methods etc.. but it doesn't get the selected Image as a file, and i do not know how to create a File as it is requested. I will give you access to the javascript file in which upload is handled. Your work are to get the selected Image added to the purchase like it was an upload from a desktop file. It has to work with the 3 plans (i will give you details in private message) the Milestone will be released when project is fully completed.