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Hello @buttinoni,
The unused files can be removed via FileManager, FTP or SSH connection. You will need to access your site’s root folder for the purpose. The exact location is:
wp-content/uploads/siteground-optimizer-assets/
If you’re experiencing issues with the process or if you need additional assistance with identifying the unused files – you can contact our team from your SiteGround’s Client Area.
Best Regards,
Gergana Petrova