Hello @mikepfive,
When enabling the WebP option for the plugin, it generates copies of all currently existing images and will keep generating such for new images uploaded from the Media Library specifically.
At the moment there’s no option for the plugin to scan for skipped images, so disabling/re-enabling the option is the only way to start the process again.
That said – any manually uploaded images via FTP or other means – will not have WebP copies generated. If any of the skipped images are uploaded via different means than the Media Library, even re-enabling the option will not resolve the issue.
If you’re a SiteGround customer, you’re welcome to reach our support team from your Client Area and we will be happy to take an additional look on your behalf.
Best Regards,
Gergana Petrova
It’s taken time (my other commitments) – But I took your advice, and contacted the Siteground support team.
What I’ve learned is very interesting….
The plugin would not convert images when:
– they are JPEG or PNG images above 1 MB in size
– they had been uploaded manually or had been generated by a theme or plugin;
– the images are not a part of the Media Library;
In my particular case I have a number of ‘large’ (over 1 MB) background images and others in sizes generated by plugins/custom code that are left untouched by Speed Optimiser.
Now that I understand the ‘rules’ – I can address the problem by altering format/resolution and adding images to the Media Library manually.