__filename__ issue in system$document entity

Hi , some filedocument object have null value in __UUID__attribute but has some value in __filename__ in system$filedocument entity.    And also while analyzing the logs wefound the below error ERROR - Core: Couldn't migrate all legacy files. There where 100 legacy file(s) which referred to a path that could not be found on the disk. Please put the files in the correct location or remove entities referring to them from the database. Files are (FileID, Name, __FileName__):   what is the usage of the __filename__ attribute and what will be  the impact if we change the __filename__ value to 0?
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