I tried appending “?debug” to an image url:
https://www.evolveyourweddingbusiness.com/wp-content/uploads/2017/07/sweet-ice-cream-photography-93638.jpg?debug
It shows that none of the local conversion methods are working. If you a controlling another WordPress site (where the local conversion methods DO work), you can set up WebP Express there, and then connect to it by configuring the “Remote WebP Express” conversion method.
You can also setup the ewww conversion method. To use it, you need to purchase an api key. They do not charge credits for webp conversions, so all you ever have to pay is the one dollar start-up fee ?? (unless they change their pricing – I have no control over that). You can buy an api key here: https://ewww.io/plans/
Finally, if you are up to it, you can try to get one of the local converters working. Check out this page on the wiki: https://github.com/rosell-dk/webp-convert/wiki/Meeting-the-requirements-of-the-converters
