In systems like Telegram, "AgAD..." is a common prefix for unique identifiers assigned to media files (photos, videos, or documents) stored on their servers. Because this is a machine-generated ID rather than a descriptive title, there isn't a "public record" or standard text describing its contents. What this file likely contains:
If you can describe a few details about the footage, I might be able to help you identify the actual title! AgADmwADcXuhVg.mkv
Look back at the chat or folder where you found it; often the message accompanying the file provides the context (e.g., a movie title, a recorded meeting, or a personal clip). In systems like Telegram, "AgAD
If you have this file and want to know what it is without playing it, you can try the following: Look back at the chat or folder where