Gilles - were you able to get your installation working in AWS? We have 7.2 on-prem but using AWS S3 buckets with a storage gateway for storage. Performance is fine storing documents however retrieving is slow through DocuWare. When browsing the UNC path they pull up fine so it's something in the configuration that is slowing things down.
Luis - were you able to get DocuWare working with AWS S3?