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That's correct, if specific objects were made public using ACL and you didn't uncheck "Block all public access" explicitly, then all other objects would be private.
Additionally for your reference, please take a look at this blog, where it says that "Block all public access" is a default setting.
Attaching snapshot for your reference:
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Hi. Yes, object acl will not affect other objects in same bucket, and default is private.
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Thanks although this is an older bucket set up in 2015/6 before recent changes. But I see the blog says “S3 buckets and objects have always been private as default”, so I guess this confirms it?
That's correct, which is why I why I highlighted that statement in the doc.