I would like to know if its possible to convert a split-apk user app to a system app. One example is the google messaging app, it has a couple of apk files, lib and oat folders and base.dm file in its own /data/app/ folder. I tried copying everything to /system/app without success.
This question has already been asked here, but it hasn't been answered.
I'm using Android 10 rooted with Magisk. I already tried moving a regular .apk file to /system/app without any issues.