Use custom background in Teams

With the lockdown currently in France, my team is extensively using Microsoft Teams.
Last friday, the latest update bring background effect with some background (with some more features coming later).

But it was not obvious how we can use some custom background.

It is simple, just put your picture in
%APPDATA%\Microsoft\Teams\Backgrounds\Uploads

You should see your pictures when selecting which background effects you want to use.
Unsplash has some pictures you can use.