There's a couple of things you can do here. You can set the Cache-Control header to no-cache on the URL you are returning for the image. Or you can always return different URLs for the images.
Cache-Control
no-cache
There are more details in this article on how to change the cache behaviour for media message files.
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There's a couple of things you can do here. You can set the
Cache-Controlheader tono-cacheon the URL you are returning for the image. Or you can always return different URLs for the images.There are more details in this article on how to change the cache behaviour for media message files.