Final answer:
Placing a sync mark on a Region (clip) involves adding visual cues or markers to indicate specific points in the video where synchronization should occur.
Step-by-step explanation:
Placing a sync mark on a Region (clip) typically involves adding visual cues or markers to indicate specific points in the video where synchronization should occur. These sync marks can be represented by overlaying text, graphics, or colored markers on the video clip. For example, a sync mark could be a highlighted frame, a timestamp, or a labeled marker indicating a specific action or event in the video.