You never delete without saving a copy, right? As soon as I changed my database from local to S3 all the new content was stored remotely. For existing content that was created before I moved to external storage, I had to copy the files to my remote storage bucket, first.

I had to overcome some challenges https://una.io/d/problems-with-setting-up-s3-cloud-storage , but since that it's working without any issue.