A JSON blob with the session data. If the user has previously logged
in to Databrary via login_db(), then session(s) that have restricted access
can be downloaded, subject to the sharing release levels on those session(s).
Arguments
session_id
An integer indicating a valid session/slot identifier
linked to a volume. Default value is 9807, the materials folder for volume 1.
vol_id
An integer indicating the volume identifier. Default is 1.
vb
Show verbose messages. (Defaults to FALSE, overwritable using option 'databraryr.vb' or environment variable 'R_DATABRARYR_VB')