Bl | - Alex.harper.mp4

You could be asking me to write or "feature" a story based on this specific file name.

While it is most likely a reference to a story, could you clarify what you're looking for? Are you trying to find the source of this video, or BL - alex.harper.mp4

Because this specific string is quite niche, it could mean a few different things: You could be asking me to write or

You might be looking for a specific "feature" or technical metadata related to a real video file (like its codec, resolution, or origin). ARGs (Alternate Reality Games)

It looks like you’re referencing a specific file name——which often appears in the context of internet mysteries, ARGs (Alternate Reality Games), or "lost media" creepypasta stories.