Access denied when put bucket policy on aws s3 bucket with root user (= bucket owner)

Uncheck 2 rows for fixing the access denied. But please remember reading it clearly and consider it before you create a new bucket. Permission is really important.

I've tried creating a new bucket and by setting the following permission parameters unchecked (false) the bucket policy can now be adjusted to make the bucket objects public. Afterwards I ticked off the four previous checkboxes and now it works.

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