How are you, probably, already know, the default F12 keyboard shortcut does not work in Blender, so you need to be sophisticated to upload a screenshot to Steam. This guide will help you with this.!
2. Go back to 2 step, to the Remote folder.
3. Create a folder called “365670”
4. Inside this folder, create another. We call “screenshots”. And going into it, create “thumbnails”
Then you need to convert this png image to jpg. It is imperative to convert, I tried to simply change the type of the picture by specifying the jpg format, but nothing happened after. So do it online or with a dedicated program.