According to the information you provided, the audio files recorded by the recording App of the MIUI13 system are stored in the following path by default:
\/ \/ Android \/数据\/ com.android.soundrecorder \/文件
You can find the folder where the audio files are stored in the MIUI13 System Recording App by opening the file manager that comes with the system and clicking on the above path one by one. Please note that this is the default setting for the MIUI13 system, and the storage location may vary if you have personalized Settings on your device or use other recording apps.