Function to retrieve and save all of the attachments to a message by id of the message.
Arguments
- x
message with attachment
- attachment_id
id of the attachment to save, if none specified saves all attachments
- path
where to save the attachments
- user_id
gmail user_id to access, special value of 'me' indicates the authenticated user.
See also
Other message:
gm_attachment(),
gm_delete_message(),
gm_import_message(),
gm_insert_message(),
gm_messages(),
gm_message(),
gm_modify_message(),
gm_save_attachment(),
gm_send_message(),
gm_trash_message(),
gm_untrash_message()