QQlivexX118 said:
Are there specific image dimensions for the warning 'tosses?
Keep the resolution ratio low (for example: 4:3, 2:1, 5:4, 1:1) for visibility's sake. You can ballpark the actual pixel width and height to be around the mid-1000s to a max of around the 2000s range if you want detail, but the preview image resizes in accordance preview size, so you can go lower if need be.