Can't clear cache

I updated an image on my website.I clicked purge cache,and I opened the develop mode.but none of them has effect.the Cf-Cache-Status of this image is DYNAMIC.But the image is still old one.

Hi, thanks for your question.

If the cache status is DYNAMIC then the asset was served from your origin server.

Are you able to share the affected URL? And if you add a query parameter (e.g. ?v=2) to the URL, does it still server an older version?

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the URL is
A query parameter is worked.But if no query parameter given,it will be an old version even the cache status is DYNAMIC.(through open the develop mode)