Hello,
Thanks for the reply. I am currently using EWWW. What I found was that after creating a webstory with upsplash library images, Pagespeed Insights still told me the images were in serious need of optimization. Not to mention my mobile speed went from a 98 to a 61. Regardless, after I saved the images locally and converted the jfif(s) to png(s), I uploaded them to my media gallery and was then able to optimize them further. They are now in WebP format and only a fraction of their original size. The page with the webstory only gets up to about 81, but I suppose this is an acceptable tradeoff. I also noticed that GTMetrix adds the time a webstory runs into the total page load time, but Google does not. Odd. Thanks again!