Registering Bitstreams in a Remote Asset Store: SRB or non-S3 options?

[Amy Ball Wicklund]

I suspect the documentation for Registering Bitstreams is outdated, specifically the part about SRB:

"To register an item its bitstreams must reside on storage accessible to DSpace and therefore referenced by an asset store number in dspace.cfg. The configuration file dspace.cfg establishes one or more asset stores through the use of an integer asset store number. This number relates to a directory in the DSpace host's file system or a set of SRB account parameters."

I'm not seeing any other references to remote storage or SRB account keys in the documentation or the config files, except for S3 buckets (which is exciting and well-documented, I might add!).

Is it possible to register bitstreams that are stored in a remote location other than the S3 buckets configurable in assetstore.cfg & bitstore.xml? 

Or must all registered bitstreams reside in either the local filesystem or an S3 bucket?

My use case would be for very large datasets that already reside elsewhere, as a way to bring their metadata into DSpace and simply link to the existing (non-AWS) location rather than having to move the large files. 

Thank you for any clarity you can provide!

~Amy