Some Android file managers rename media this way when moving files between folders or SD cards.

A universal digital multimedia container format used for high-quality video and audio. Potential Contexts

The recording started at 3:53:52 PM (using a 24-hour clock).

Because this naming format is generic, the actual content of the video depends on the device used:

This usually indicates it was the first file in a sequence or captured by the primary camera lens.

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2021-09-27_15-53-52 - Video0mp4

Some Android file managers rename media this way when moving files between folders or SD cards.

A universal digital multimedia container format used for high-quality video and audio. Potential Contexts 2021-09-27_15-53-52 video0mp4

The recording started at 3:53:52 PM (using a 24-hour clock). Some Android file managers rename media this way

Because this naming format is generic, the actual content of the video depends on the device used: 2021-09-27_15-53-52 video0mp4

This usually indicates it was the first file in a sequence or captured by the primary camera lens.