If installing the app directly did not work, rename the file from apk to zip.
Flash it using TWRP or Orange Fox (or any other recovery).
The app is now installed. If you don't find it on the phone, rename the file back from zip to apk and install it (it will work this time).
Enter Magisk and click on update.
Also, if you want the ANX camera, I posted how to install it and the files on comment #1426.