No WebP images after bulk process is done

Hi,
I just installed Your plugin and ran bulk optimization on whole Media Library. Stats says that 100% of images were converted to WebP, but I can’t find them anywhere in “uploads” directory. I ran bulk optimization after disabling “Automatic removal of files in output formats larger than the original ones” option. WebP images are also not served on website, but I work on rather custom Nginx server, so it may not work out of the box. I need to find those WebP images first to fix server configuration.