It's weird, I can't add new wallpapers to the Opera GX, can anyone tell me if they have the same problem?

I found out this article, saying that Opera supports customizations of the tiles' icons, but I cannot find this in my Opera version(it is updated to the latest version)

A very good extension, I hope someday chrome webstore can support this extension too, which would be more convenient for chrome users on mac.

@jerryalexo It is a pity, I am planning to discard Edge and Chrome to switch to Opera completely because the Opera developer team has done such a splendid job in terms of detail features like the My Flow and Pinboard(Edge has its counterpart but it is not so customizable like Opera's Pinboard)

Guys, I just switched my computer from windows to mac recently, and I attempted to install Infinity New Tab Extension(a new tab extension) on opera. Someone in an Opera forum said that new tab extensions work on mac but it doesn't.
In fact, you can set up Infinity New Tab Extension in Chrome and then turn on cloud sync. This Infinity New Tab actually has a corresponding webpage to it: https://m.inftab.com/#/
Anyway, I am still trying to figure out one way to do that. I found out some probable solutions to this problem on reddit:
https://www.reddit.com/r/operabrowser/comments/nm12vj/new_tab_extensions_not_working_opera_gx/

It's weird, I can't add new wallpapers to the Opera GX, can anyone tell me if they have the same problem?