Hello Olaf,
50% of our API requests are image uploads. If you could provide the possibility to upload all images at once, we could significantly reduce our API requests. For example, you could pack all the images into a ZIP file and transfer it. That would be a very simple solution. You could then simply send back the IDs in the XML response, and we would be good to go. It should also be in your interest to reduce the API requests.
Best regards, Philipp