Sep 21, 2018

How to Add Metadata to an S3 Object?

Choose the S3 object,

Choose Properties, and then choose Metadata.
For example, 
add        x-amz-meta-mode=   '33188' to defined the permissions "rw-r--r--" instead of "---------" in S3 bucket.

0644 (octal) or "rw-r--r--". 33188 is the mode in decimal.