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Hello @mstudioil
Hope you’re doing well today! Thank you for reaching out to us.
Indeed, to use WebP images in Smush, it will need a Pro version.
You can find the reference to this in the WordPress.org-Smush plugin’s FAQs section under the question –
“My Google PageSpeed test is telling me to serve images in Next-Gen formats. Can Smush do that?”
Here is the direct link to the reference.
Hope it helps.
Kind Regards,
Saurabh