Want to set a custom image as screensaver

What steps are included in the "all the steps" that you have tried? Knowing what you did and why did not work may help us help you.

I would suggest pushing the image to the devices with a package, and using a configuration profile to force that image as the screensaver. However, not all images will work as there are limitations. 

Side note: Get rid of anything running Catalina and Big Sur. Catalina was retired last August, and Big Sur will be retired this coming August. Never run an unsupported/patched operating system.

This has been a challenge for all of us setting screen savers in Sonoma. This thread is long but it will provide a lot of information for Sonoma. https://community.jamf.com/t5/jamf-pro/custom-screensavers-in-sonoma/m-p/310023#M269660

My final solution was to use a script that we were using for Ventura modified to use a different file path for the screen saver component that drives the slideshow and also a script from this Github repository. https://github.com/itjimbo/macOS-Screen-Saver-and-Wallpaper

When I finished this project I was even more against setting screen savers on our Macs. No one sits and stares at their screen when they're not using their Mac, and the best way to "save" a screen is to allow it to turn off when not in use.

Is there any update for this issue? I want to deploy a picture as a screensaver.

The solution that I posted in the Jamf thread I included in my last response here still works. What I used was my own script modified to use the file path to the new component in macOS Sonoma that now drives image based screen savers and I used a solution provided by someone in Github. I still think this was a huge waste of my time but I was happy to post my solution so others who are being told to deploy useless screen savers can make them work.

Hi Howie, I've been following your guide and it works like a charm for wallpaper! But for Screen Saver, no matter what picture I used the output for screensaverBase64 is always the same: 

(YnBsaXN0MDDRAQJWbW9kdWxl0QMEWHJlbGF0aXZlXxBEZmlsZTovLy9TeXN0ZW0vTGlicmFyeS9FeHRlbnNpb25LaXQvRXh0ZW5zaW9ucy9pTGlmZVNsaWRlc2hvd3MuYXBwZXgICxIVHgAAAAAAAAEBAAAAAAAAAAUAAAAAAAAAAAAAAAAAAABl)

And when I apply the screensaverBase64, it didn't apply my desired Screen Saver but it will prompt back to the last screen saver that is set (In System Settings > Screen Saver > Other > Photo).

Is this expected behavior or am I missing any steps here? 

Thank you in advance!