Moving apps as system apps

I have recently rooted my android phone (galaxy s7 edge), the first rooting i have ever done.

I then tried to move an app as system app, all seems to work fine, but when i reboot the app is missing from my overview of apps and is seemingly uninstalled.

I tried moving it using lucky patcher, link2SD and /System/AppMover. Also tried to move it manually using ES File Explorer. So i have explored like 4 possibly ways to do it and all end up with the same result.

Can anyone tell me what is...

Moving apps as system apps

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