This format strongly resembles a , such as: A Google Drive file ID (often 33 characters long).
Because this ID appears to be private or internal to a specific system, I don't have access to the underlying content. 2018-04-06_1aIBdk9cTHWKETaIyUYSqQZlVTmpa4ek - @...
Could you provide more context on where you found this ID or you'd like me to write about instead? This format strongly resembles a , such as: