I just copy MiuiCamera folder to my /system/priv-app/MiuiCamera (use magisk for root access) & use Fx file explorer
, you can get it here:
http://www.mediafire.com/file/nr4oxcj4m7w7h92/MiuiCamera.zip/file
Credit to fw85-
Don't forget to backup the original MiuiCamera folder beforehand