I’m not a user of Polish, but what I understood from that post and other Cloudflare documentation on the issue is that it will serve WebP files whenever the browser is ready for the format. It won’t change the filename, though, so you’d have a JPG file named file.jpg served in WebP format but still named file.jpg. The file format is added in the HTTP header “content-type”. So as long as Polish is turned on, it would generate the WebP formats for both JPG and PNG files. You can see how this works in this reply to another question on Polish here in the forum:
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