Custom Theme RPI4 Lakka OS help

Raspberry pi 4b 4gb OS: Lakka Nightly build rpi4-arm

Im trying to create my own theme but for some reason when I try using them from LAKKA_DISK/assets (storage/assets) it does not work. I renamed my folder custom and im still having problems trying to create a theme for my raspberry pi 4 running Lakka OS. I even put directory config to direct it there instead of temp/assets.

I also tried making a folder in storage to redirect it from directory and place them there but its not working for me either. Some help would be appreciated.

I also want to make my icons a bit bigger so would I be able to get 300 by 300 px resoultion icons to work.