Hello @jong Thanks for the reply.
What we are seeing is something different than you describe, we are seeing the same images being uploaded over and over again every single time a page is loaded. images that already have been uploaded to the s3 just fine.
Basically on every page load it is uploading the images again and again, many multiple times, that it is going to download saving neither bandwidth nor time. Also this means that the upload is never completed and the page takes several minutes to load.
We had to disable the plugin in order to get the site working.
The client does need this functionality so we either need to get this fixed and working or switch to an alternative solution.