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Hello @zhangxiaosong,
I noticed that your website is currently utilizing our Basic CDN service, which does not support dynamic caching. If you would like to take advantage of the dynamic cache feature, it is necessary to either upgrade to the Premium CDN plan or simply disable the basic CDN.
If you still encounter any issues after that, please open a support ticket from your SiteGround Client Area. This will allow our team to access and inspect your application and provide more targeted assistance.
Best regards,
Dimo