Magmi - Imageattribute processor is not working with WEBP images

Hi,

We are trying to import images that are converted to webp by our supplier. This is not working, the files that are downloaded are not correct. The filesize is only 190b and in the Magento backoffice nothing is visible.

Maybe it is due to the headers that the imageprocessor uses, but I don't exactly understand how Magmi works?