Redirects on NGINX

[webeditors]

I think I'm in the situation described in troubleshooting where my images are being served by NGINX, so the redirect changes I'm making in .htaccess are having no effect. I followed the two links suggested, but as I've never fiddled with NGINX config before, I'm none the wiser as both links seem to assume a webp version already exists and I guess I need to recreate the .htaccess method of sending any request for a jpg or png to the webp PHP script.

Any chance then, you might be able to add the instructions on how to do this on NGINX?

Cheers

Pete