[Q] How to change boot animation? topic

I'm running Cyanogenmod on my LG G3 D855. I know I can copy my custom bootanimation.zip to /system/media to change the boot animation, but that gets overwritten each time I upgrade with Cyandelta. I tried putting the zip into /data/local, but it doesn't change the boot animation. How can I change it so that it will survive OS upgrades?