It’s a UUID – a unique identifier that avoids the problems associated with filenames, namely weird characters (think non-roman alphabet characters which may or may not be supported on a given system), multiple files with the same name, filenames that contain personal information etc.
Instead the file is given a UUID and then this is stored in a database along with whatever information you want, so that the two are associated and you can retrieve the correct file despite its name being a load of balls.
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