We do have the same thing; I noticed some months ago that no matter what file type we use to upload our images, they are only downloadable as WEBP. This is a popular image format for web pages because of the high quality and low file size, but it is challenging when trying to download an image.
I’m not sure whether Gainsight is now automatically converting uploaded images to that format for the sake of faster page loading times, etc., or whether there’s any way to adjust it.
In the meantime, if you have an image that you want people to be able to download, in addition to embedding it for display, you could attach it to the article and provide guidance for downloading it from there. Bit of a workaround, but I think it would solve the issue.