Question: Replacing Image Files

[Hube2]

I usually include the plugin Enable Media Replace to allow clients to replace images, this can be done to either replace an image with a different one or to replace with a smaller/optimized version. This retains the original URL for the image.

When I set up WebP Express I set it to only convert images that are requested.

My question is, will the new image be optimized and served of will the original converted image continue to be served?

If it is the latter, is there a way to purge the old version of the converted image?