FTAM — Use of Directory in transfer/insert/append/delete operations

The interface Directory derives from File and can therefore be used as
an argument in FileTransferSession::transfer/insert/append/delete calls.

Directories are only mentioned in the description of delete. Is the delete
of a directory recursive or must the directory be empty first?

And what is the behavior of transfer,insert,append when one or both of
the arguments are Directories? Is this legal at all?

Action Requested: Specify behavior when a Directory is used as src or dest
argument to transfer,insert, and append. Specify recursive behavior for
those operations and delete.

see above