If your downloads folder is becoming a graveyard of alphanumeric soup, here are three ways to take control:

When someone uploads a video directly to a chat without selecting "Send as File," or if the original metadata is stripped, Telegram assigns its own internal ID as the filename. This ensures the file is unique on their servers, even if it makes it impossible for you to tell what’s inside without clicking play. How to Deal with "Mystery" MKVs

Blog Post Draft: The Case of the Missing Filename: Decoding Your Telegram Downloads