I don’t know what a .webp file is but I don’t like it. They’re like a filthy prank version of the image/gif you’re looking for. They make you jump through all these hoops to find the original versions of the files that you can actually do anything with.
Edit: honestly I assumed it had something to do with Google protecting themselves from image piracy shit
They’re a pain in the ass sometimes because I can’t say, download one and send them in certain chat programs. But you can use a program like Gimp to convert them easily.