Transfer is always in one of the three transfer modes :
Transfer is in a queue, which means that it's ready to be started whenever it's possible. For better explanation see Queueing.
Transfer is scheduled to be started at some later time. Caitoo checks every minute whether there is some transfer that should be started. It takes into account the maximum number of allowed transfers. Transfer time is set in Transfer Configure Dialog.
Transfer is simply added to the list. Caitoo will not try to start it. You have to start it by hand, or change it's mode to queued or scheduled.
This is useful if you work offline, then you can set Add new transfer as delayed in a preferences dialog.
Use this feature if you have problems with connecting to server or slow connection and want to download files later.