“Unified” means that there will only be one recording. If you stop the recording and then restart it, the recordings are automatically juxtaposed to create a single recording.
“Multiple” means that there will be as many recordings as times that you stop and restart the recording in the activity.
“Manual” allows you to stop and restart the recording of the activity at any time using the spool icon at the top of the screen. The recording does not automatically start at the same time as the activity in this mode.
In “Automatic ” mode, the recording is automatically started five (5) minutes prior to the activity. It can also be stopped and restarted manually at any time, again with the spool icon.