I purchased your WebP plugin and it seems to be working fine, but I have a question.
Google doesn't seem to be very pleased when doing a webspeed test because all of the converted images no longer seem to have an expiration date for browser caching. The usual date we have set is 7 days, and after we installed the plugin, there is no caching at all on images now.
Should we be concerned about it? Do images no longer get cached on the users computer?