Vid-20201219-wa0370mp4 Instant

Since the filename itself contains no descriptive data about the video's content (such as "Birthday Party" or "News Report"), the only way to know what the "topic" is would be to:

: You found this file in your phone’s storage or a cloud backup and are trying to identify what it contains. VID-20201219-WA0370mp4

: You may have seen a link or a mention of this filename in a group chat or a forum where someone shared a video without renaming it. Since the filename itself contains no descriptive data