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
Just relaying what worked for me. Tried uploading with .webp and it didn’t work, tried with .jpg and it did. Didn’t matter to me whether it was a real conversion or not.