B63kxx7mnixc1cpxj4seisvkrufhzrru.mp4 -

Since the filename is randomized, you can find out what the video is by:

: You exported your library, and Google renamed files to prevent naming conflicts during the bulk download. B63kXx7MNixC1CPxJ4SeIsvkruFHZrRU.MP4

: This alphanumeric string is a unique identifier (hash) assigned by Google’s servers. It ensures that every file remains distinct within their massive database, even if multiple users upload a file named "video.mp4." Since the filename is randomized, you can find

: You saved a video from a shared link or album where the original filename wasn't preserved. Since the filename is randomized

: If downloaded via Takeout, there is often a .JSON file with a matching name containing the original title and capture date.