Issues with animated wallpapers

couch

couch

Reposted to include extra information,
Using MacOS Big Sur 11.5.2

I've followed a few guides using .webm, .jpg and persona.ini files to create some wallpapers, however when it comes to the selection screen, the .zip file is greyed out. Does it have something to do with the fact that I'm using MacOS?

My persona.ini looks something like:
[Info]
name =
author =
url =
version =

[Start Page]
background = video.webm
position = center center
title text color = #FFFFFF
title text shadow = #000000
first frame image = cover.jpg

The contents of the .zip archive are:
cover.jpg (434KB)
video.webm (6.3MB)
persona.ini

Used text as my screenshots would not upload.

In the meantime, I've been using a .webp animation as a replacement, but I notice considerable lag in the animations and the browser when opening a new tab. Is there a way to optimise this? I've tried disabling hardware acceleration, but it seems to have no effect.