Thank you once again, but still I can't get it to work.
It seems it has something to do with the SVG format itself.
Both the root folder and wiki folder replaces the logo when logo.png is inside them, but not when logo.svg is there.
I've tried with both svg and png in both folders , only one format at any given time, and only png seem to work.
Screenshot of wiki folder: https://ibb.co/Kh5prD4