Unable to Customize Login Screen (KDE)

Seems like no matter which route I take, the login screen refuses to change. I'm using Nvidia KDE image on a desktop.

Attempt 1 - System Settings -> Appearance & Style -> Login Screen (SDDM) -> Breeze Fedora, Change Background -> Load From File -> Select a new file -> Apply
When I log out, the screen still shows the original background image (a painted river/trees).

Attempt 2 - System Settings -> Appearance & Style -> Login Screen (SDDM) -> Get New -> Choose Login Screen to install -> Install
The below error is provided.
An error occurred during the installation process:
The installation failed with code 255 while attempting to run the command:
sddmthemeinstaller -i /tmp/monochrome-sddm.tar.gz

The returned output was:


Attempt 3 - Download lock screen from kde store (https://store.kde.org/p/1283380) and extract to /etc/sddm/themes
Does not show in Settings.
Attempt 3.5 - Just place the .tar.gz in the directory....?
Still doesn't show.

Attempt 4 - System Settings -> Appearance & Style -> Login Screen (SDDM) -> Install From File -> Select downloaded tar.gz file
Could not decompress archive

Attempt 5 - Manually open Ptyxis and run the command sddmthemeinstaller -i /tmp/monochrome-sddm.tar.gz
Could not decompress archive

Attempt 6 - Discovery Store -> Plasma Addons -> Login Screens -> Select theme/install
sddmtheme.knsrc: An error occurred during the installation process:
The installation failed with code 255 while attempting to run the command:
sddmthemeinstaller -i /tmp/monochrome-sddm.tar.gz

The returned output was:


I'm officially out of ideas - any thoughts on how to change my login screen from the default?
A dark theme inspired by black and white photography.See the project page for more information and recommendations.
Solution
I suspect that these instructions for Kinoite will work. https://www.reddit.com/r/Fedora/comments/12ywfst/kinoite_how_can_i_change_login_background/ but be careful when editing your /etc/fstab folder as you can end up with an unbootable system. I''m going to test them now
Reddit
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