Currently, all major browsers support the WebP format. Which is a great format performance-wise. Now I know that HubSpot converts other formats to WebP serverside, but we should expect users to upload the WebP format as well.
One of the most powerful HubL functions is the 'resize_image_url' function, which allows you to resize the served image without having the client resize the image themselves (which is great, because clients never do this 😜).
HubSpot also offers the option to clone, crop and resize images, which is a great feature of the file manager.
The problem: The WebP format does not work with the 'resize_image_url', also, passing the name, width and height in the image URL does not seem to resize the image at all. So this is a major issue performance-wise. Furthermore, it currently is not possible to clone and resize a WebP image from the file manager.
The solution: Make sure that the 'resize_image_url' and the file manager functionalities also work with the WebP format.