What if the undertaker of the procuratorate doesn't let the lawyer copy the case file?

He was detained in Leizhou detention center in Guangdong for nearly a year because he was falsely accused of destroying property. Finally, the procuratorate dropped the charges and let me go. Now I have reported the case to the original police station, accusing the other party of falsely accusing me, and entrusted a lawyer to the procuratorate to copy the case file for evidence collection, but the procuratorate refused to copy it. Is the law allowed to prevent the victim from copying the case file?