This is a standard way to label the first video in a series of lectures or chapters.
Knowing the platform (e.g., a forum, a cloud drive, or a security app) will help identify exactly what the file contains. ch1.mp4
In technical communities, "ch1.mp4" is used as a placeholder in code or scripts. This is a standard way to label the
omarscu - Power System Protection (MCH 416) - 2018-2019 - Google a cloud drive