Problems with Wallpapers

Hello everyone,
i have a Problem with the easyest Thing on a OS and it drives me Nuts.
I want to change my Wallpaper (yeah that simple)
I go “right Click” on desktop >>> Change Background >>> “Add Picture” in Top Right Corner >>> navigate to the Picture >>> select the Picture >>> and Then in The top Right Corner “Open” is greyed out. i Cant use it.
i tryed SU it Tryed to copy the Files into /usr/backgrounds/budgie/ but i cant select them.

Why is that so ?
Pls help

Duplicate of this "Open" greyed out while trying to change my wallpaper (Budgie 24.04)