These files are maintained within onedrive.  File links, permissions and passwords are set on a per file basis.  Presently, the files are hosted in dcarter's onedrive but can be hosted in any MSBA user's onedrive.  Once the files are created in a onedrive folder, the "share" option is used, and the gear icon next to the "copy link" button is used to set the permissions.  Once the link is copied, it is pasted here as a hyperlink for the respective file.