Need help with android custom system apps

So I wanted to make some apps a part of my system apps. I placed the ES File Explorer application in the /system/apps/ directory and when I factory reset the phone, it was installed as a system app and it ran without a problem.
Now when I put Microsoft Office application in the /system/apps/ directory, it crashes . So my question is that how can I make this app a part of the system apps such that it runs without a problem when I factory reset the phone. I also changed the permissions of the app when I place it in the /system/apps/ directory but it crashes.

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