question: public Long addFolderByExternalUserIdAndType ( String SID , String externalUserId , Long parentFileExplorerItemId , String folderName , Long room_id , Boolean isOwner , Long externalFilesid , String externalType ) throws AxisFault { try { Long users_id = sessionManagement . checkSession ( SID ) ; Long User_level = userManagement . getUserLevelByID ( users_id ) ; if ( authLevelManagement . checkWebServiceLevel ( User_level ) ) { Users userExternal = userManagement . getUserByExternalIdAndType ( externalUserId , externalType ) ; Long userId = userExternal . getUser_id ( ) ; log . debug ( "addFolder " + parentFileExplorerItemId ) ; if ( parentFileExplorerItemId == - 2 && isOwner ) { return fileExplorerItemDao . add ( folderName , "" , 0L , userId , room_id , userId , true , false , false , "" , false , false , externalFilesid , externalType ) ; } else { return fileExplorerItemDao . add ( folderName , "" , parentFileExplorerItemId , null , room_id , userId , true , false , false , "" , false , false , externalFilesid , externalType ) ; } } } catch ( Exception err ) { log . error ( "[addFolderByExternalUserIdAndType]" , err ) ; } return null ; }
target:  to add a folder to the private drive, set parentFileExplorerItemId = 0 and isOwner to 1/true and externalUserId/externalUserType to a valid user