Here is the video again : https://we.tl/t-qdMTbiqOn6

The link will expire after a few days :)

I prefer to avoid screen sharing with someone I do not know, I'm not comfortable giving access to my computer remotely. Sorry for that.

Here is the video :  Video via WeTransfer

Each time I click on the button Apply changes.

Hello,

thank you for trying to help me.

I clicked on the Apply changes button each time i tried to change the background. But nothing happens. I disabled the ad blocker too, but that does not change anything either.