Caching Issue with Image File


I have an image file that gets auto updated via FTP (overwritten) every 5 min. It is then embedded on a website running WordPress. There is no WP caching plugin turned on and I have made the following page rules:

* - Cache Level: Bypass
* - Cache Level: Bypass
Browser TTL cache is set to 5 min.

Yet the image seldom updates. What can I do; did I incorrectly configure something?

The webhost technical team cannot understand why there is a newer file in the directory (confirmed if one downloads it via FTP) yet if the absolute path to that same file is entered into a browser it shows an image that can sometimes be several hours old.

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