Based on the structure of the text you provided, it appears to be a specific filename or an auto-generated label from a file-sharing session rather than a standard, recognized feature of a major platform.
: Offers 15 GB of free space and easy link-sharing permissions. tlz Real_len.mp4 - Share Files Online
Could you please clarify you saw this feature on, or provide a bit more context about what you are trying to accomplish? Based on the structure of the text you