おっ、private付けるのなんとなく気持ち悪かったからよかった
>Requests with the header `x-amz-acl: public-read` are no longer rejected.
[R2] Update changelog by sdnts · Pull Request #6892 · cloudflare/cloudflare-docs https://github.com/cloudflare/cloudflare-docs/pull/6892/files