In the Steam top bar there should be an option to access screenshots, then click on go to folder and copy-paste the images you want to post here.
To get the highest quality, follow these steps 1.click on "view" on the top of steam 2. Find "Screenshots" 3. click that and find "BeamNG.Drive" 4. click "Show On Disk" 5. Find your image and drag it into the beamng text box OT: have a legran from 2020