It is messy as:

• Files are in the same folder (so it complicates using an external location and read-write permission)
• Unity Catalog is designed to have tables, and you grant access to tables

I don't know what the files are. Unstructured data can be included in the delta file / metastore table (array or binary).

You could also put these files outside of databricks and manage access separately.

@Werner Stinckens,​ is it possible to have Unity Catalog and mount another storage container under the dbfs path using credentials passthrough?