Hello @simongcc ,
The plugin optimizes all JPEG and PNG images uploaded through the WordPress Media uploader. It does not optimize images that are manually uploaded or embedded within theme/plugin files. Additionally, the plugin does not handle the conversion of PNG images larger than 1 MB.
The plugin also generates WebP versions of images located in the Media Library. Images that do not have WebP copies are typically those hardcoded by themes or plugins. There is no feature to convert specific images to WebP directly; however, you can sync these images to the Media Library and then use the bulk generation feature to create WebP files.
If these steps do not resolve your issue, it is advisable to submit a support ticket through your SiteGround Client Area. Our support team can then examine the issue more closely and provide detailed assistance.
Best Regards,
Stefan Stefanov