Welcome, this guide will detail how to create custom thumbnails for your workshop levels.
We will need 1 or 2 art tools to get this done, mostly anything will work.
Some suggestions are
-Microsoft Paint
-Microsoft Paint 3D
-Illustrator
-Paint.net
-Photoshop
-Gimp
To begin, load up your level in the PTTR editor. Playtest your level and click "P" to set a temporary thumbnail.


For our example, the thumbnail will look something like this:


Now you'll need to open Windows Explorer (or other file explorers) and navigate to (Storage) > Users > (Yourname) > AppData > LocalLow > South East Games > Paint The Town Red > CreatedLevelPreviews. You should see a file with your level name. Next we'll open the file and start to edit it in our art tool of choice.


When you are done, you may have something like this. Note: You can import your own images as long as they fit the level name.


Now go back to your level and click "upload". You should then see your new thumbnail appear in that window, which will be visible on the workshop once you upload.
Thank you for reading, leave any feedback in the comments.

Setting Up Guide And Layout { Stuckcup }
Creating Guide And Screenshots{ Supa Player }