my interview an test for naturalization. But the case isn't approved and it is under file review. Is there a any particular reason for this extra step?
There are many possible reasons including if you requested to change your name, to verify information in your application, and to investigate your case further. Without more information, it's impossible to say. You would know if there's something in your history that they could be investigating. You should not write about it in this forum, but you may want to consult with a lawyer before getting an answer from USCIS to determine what the problem may be and if there's something that can be done about it.
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