I found a close solution below, but it is about deleting old version of the attacments. It doesn't look like deleting latest live version of the attachment.
I need to delete latest live version of the attachment too, if it gets over certain retention period.
Hi @shinsuke inomoto ,
unfortunatley there's no option to do that using builitin features.
You can try this third part app https://marketplace.atlassian.com/apps/1216120/cleaner-for-confluence?hosting=server&tab=overview
Hope this helps,
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