I would like Esri to consider adding the ability to store attachments tied to a hosted Feature Service layer to be stored in a Cloud Store such as S3, Azure Storage rather than on disk. The benefits of storing the data on S3 are several: 1) scalable, elasticity, 2) cheaper storage, 3) redundancy and disaster recovery. Thank you for your consideration.
Thank you for brining this to our attention! If you haven't done so, please cross post this to ArcGIS Enterprise Ideas. There the community and product teams can take a look at this and vote on it.