@BoneYard Awesome. Great you got it to work. Thank you!

Hello again, yes.... weirdly I did a bit of trial and error the other day and have solved it. And noticed how the image gets reset if you go into the editor. But I am keeping back-ups and the thumbs saved in Krita should I need to update them. Thanks for the reply, nice cars! :)

Hello Mr. @BoneYard Go to your Steam library and right click on Screw Drivers. Then go to MANAGE - BROWSE LOCAL FILES. There you see a folder called "Cars". In this folder you'll find a .png-file for every build in your garage.
Create a thumbnail picture (400x400) save it as a .png-file and name it exactly like the .png-file of the build that you created the thumbnail for. Copy it to the cars folder and overwrite the existing .png-file. Now your build will show the new thumbnail in the garage and also on the workshop, if you upload the build.
But be careful! If you edit the build you made the thumbnail for afterwards, the thumbnail will be automatically replaced with the auto-generated one again! So always keep a copy of your thumbnail outside the cars-folder!

Subscribed :D

Hello Mr Catburger, how do I change the 'workshop thumbnail' with a custom one like you do? Really need my cars to stand out but cant seem to find how you do that? Thanks in advance.