S3 Bucket objects restricted access policy as per Discourses groups

Reading Setting up file and image uploads to S3 I’ve setup the Amazon S3 Bucket and Discourse but I haven’t figured out a way to make S3 objects “private” in the way that only Discourse users that can access the posts that contain that images / files can access the objects.

I mean, I’ve setup a Discourse for work which requires login for accessing and I don’t like that a user that can access some S3 object can pass a link to someone that can’t

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Hi !
see the secure media parameter and


thank you so much I haven’t found that topic by searching. It is what I need