Photoshop Error: saving smart object files

If you have downloaded the PSD file from the Internet then the person who uploaded it there have not attached the displacement map file along with the final file.

So, When you save layer "Change your design here," it says "Could not find the file" because photoshop opens it as PSB file in the Temporary file folder on your computer. Not the original file which is missing.

The solution is, you create your own displacement maps and then "Double click" on "Displace" of your smart object and replace the file.

Now you have your new displacement map somewhere saved on your computer which will be used every time you change your design.

Creating Displacement Map is extremely easy and if you are new please watch any youtube video!

Thanks.

Hello,

I am curious whether sbilottadesign figured out how to resolve this?

This problem is something I just ran into a few days ago as well. It's definitely a conflict between CC 2018 and the mock-up files that designers are sometimes using. To make this easier to understand for everyone, I believe sbilottadesign is using a "purchased" mock-up. This is at least the case for me -- I happen to also be struggling with t-shirt mock-ups. These mock-ups feature a smart object which, when clicked, opens a PSB file. Once artwork is placed in the PSB and saved, the "Could not update smart object files because the file was not found." message appears.

In case anyone has an idea what might fix this, any help is greatly appreciated.

Are you sure you get this message for Placed Embedded smart object layers.  The file would be embedded in the layers object which leads me to believe your layered file is corrupt.  Is it only with files you have uploaded or do local file also fail with that message?