@lukeatreides said in Not accepting .webm or .mp4 for custom animated wallpaper anymore?:
But I will say, this used to be easier
It looks like some Chromium API changes broke loading webm directly. No guarantees, but there's hope that direct webm loading will work again in the future. It's not a simple fix, so it might take a while. Again, no guarantees. Consider building the zip file with the webm and persona.ini in it to be the correct and official way of doing it now.