S3 Attachment Service in KFS
It was mentioned that we strip out the directory structure of the attachments and the s3 attachment service expect the objects to be in the root of the bucket. This will need to be accommodated in your migration process. We used an intermediary staging bucket with a lambda that is triggered on object create to remove the directory structure and move the file to the final bucket.
S3 Attachment Service in Rice
In order to enable the s3 attachment service in Rice, please see the instructions at https://github.com/KualiCo/rice/blob/master/README.md#running-with-s3-attachments