Can't change lock screen background image.

I have found the solution. Windows will only let you upload an image as a lockscreen when the image preview is available from file explorer. If you changed an image from webp or something similar to jpg or png, try uploading the image somewhere then redownloading it as initially a png. (Saving it to the "Pictures" folder also I think might help as the image preview is available there.) Once you have saved it as initially a jpg (I used paint.net to resave it as a jpg) the image preview will now show and windows will let you upload it as a lockscreen. Hope this helps!

Thank you for posting the instructions on how to do this. Unfortunately, I've tried these methods and it's not working for me :( What else can I try?

Follow this tutorial and it will hopefully fix your problem guys: https://www.youtube.com/watch?v=s3d7WjeVOV0

Hi

Welcome to the Microsoft community.

We fully understand the inconvenience the issue has caused and that the current situation can be frustrating.

From your description, it seems that you have tried many methods, but they are still ineffective. You can try the following methods, hoping to help you.

Method 1

Go to the Settings – Personalization – Lock screen. And then make sure that the Background option is not Windows spotlight. If so, change it. If that page is inactive and blurred, and it says “ Some settings are hidden or managed by your organization”.

After that, open run command box and enter the following command:

Command 1:

%USERPROFILE%/AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets

And click “OK”. From the next window named “assets”, delete all files in it.

Then, once again, open the run box and enter the next command:

Command 2:

%USERPROFILE%/AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\Settings

In the next window, rename the two files in it by adding .bak to their existing names, so it will be:

Roaming.lock.bak

Settings.dat.bak

After closing that window, restart your computer. After restart, change the background option as “Windows spotlight”. If this second method works, don’t forget to open the run command box once again, and enter the second command:

%USERPROFILE%/AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\Settings

And then delete the renamed two files.

Method 2

Set the Lock screen background to “Windows Spotlight”. Then open the Windows PowerShell as administrator and enter the following command:

Command 3:

Get-AppxPackage -allusers *ContentDeliveryManager* | foreach {Add-AppxPackage "$($_.InstallLocation)\appxmanifest.xml" -DisableDevelopmentMode -register }

Then close the window and restart your system. After restarting, Check whether the problem still exists?

I await news.

You are welcome to reply to this topic, and I sincerely thank you for your support of Microsoft products and services.

Best regards

Derrick Qian | Microsoft Community Support Specialist

* If your problem is not solved, you could reply to the post again and we would continue to provide technical support for you.

* Please check and vote this answer if it helps as it will be beneficial to more community members reading here.

I have followed the instructions provided by your reply, unfortunately I have yet to find a working solution for the problem.