If you did not personally trigger this download or receive it from a trusted contact, exercise caution. MKV files themselves are generally safe, but they are often used to distribute large media files from unknown sources.
Specifically the Telegram Video or Documents directory on your device. AgADkwgAAmRUiFY.mkv
Do you have on where this file was found or what you expect the video to be? If you did not personally trigger this download
The prefix AgAD is a common characteristic of Telegram's internal file naming convention for media attachments. Because this name is an alphanumeric string generated by a server rather than a descriptive title, the specific content of the video cannot be determined by the filename alone. Technical Profile AgADkwgAAmRUiFY.mkv