If it's not in the PROC S3 doc, it's not available, so there is no tagging option in PROC S3.  You will need to use other tools for this (such as the AWS cli).  You can submit this as a feature request/idea here and perhaps SAS R&D will implement it in a future release: https://communities.sas.com/t5/SASware-Ballot-Ideas/idb-p/sas_ideas ... View more