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This specific naming convention ( video_YYYY-MM-DD_HH-MM-SS ) is the default for Telegram. The time "01-12-20" indicates it was saved or cached at exactly 1:12:20 AM on April 27, 2021.

The filename is a generic timestamped name typically generated by messaging apps like Telegram when a user saves a video to their device [1]. Because this name is automatically assigned to thousands of different videos, there isn't one specific "guide" for it; rather, it refers to the process of identifying, managing, or recovering such files. 1. Identifying the Source

To find where it came from, check your Telegram "Saved Messages" or chat history from that specific date. 2. How to Open or Fix the File