After I tried to figure out how to hide panels while playing WoW I saw that desktop was black without my wallpapers, I figured out that i had to click my wallpaper inside Desktop Settings to show my wallpaper again but after that Slideshow didn't work, so I tried a system wallpaper and Slideshow worked. I tried to delete all my wallpapers, move all wallpapers to another path and changing path but didn't work.

The “Slideshow / Sfondo Periodico” feature only works with default system wallpapers now sadly on my laptop :(
When selecting any user directory (e.g. ~/Immagini/ARTE), the background turns completely black after selecting one of your wallpaper and activating Slideshow.

Steps to reproduce

Add your Wallpapers

Activate Slideshow

Install Classic Menu

Install Tweaks for COSMIC

Do a bit of change there and there

Uninstall Classic Menu and uninstall Tweaks for Cosmic

Install again Tweaks for COSMIC

Wipe all config reset gnome

Open Settings again Background

Enable “Slideshow”

Select your wallpaper then Activate Slideshow

Background turns black

Selecting default COSMIC system wallpaper works correctly

Expected behavior

Slideshow should work with any wallpaper not only system wallpaper folders.

Actual behavior

Only default system wallpapers work

OS: Pop!_OS 24.04 LTS (Nvidia)
Desktop: COSMIC
Session type: Wayland
XDG_SESSION_TYPE=wayland

CPU: Intel Core i7-8750H (6 cores / 12 threads)
Architecture: x86_64

Graphics:

iGPU: Intel UHD Graphics 630 (i915)
dGPU: NVIDIA GeForce GTX 1060 Mobile
NVIDIA proprietary driver
OpenGL renderer: Mesa Intel UHD Graphics 630