The prefix and format are common for media downloaded or cached from social platforms or video editing apps (like Zappp.ph or similar mobile applications).
It appears to be a specific video clip ( VID-84 ) from a personal or proprietary collection, where " nagyszandi " is likely a username or project handle and " Zappp " refers to the specific project or application (e.g., a quality improvement initiative like the one mentioned in GOSH Trust papers ). nagyszandi_Zappp_VID-84.mp4
If this video is part of a specific course or a tool you are using, please provide the where you found it, and I can help identify the relevant documentation. The prefix and format are common for media