Model viewer screenshot shadows

I would like to know how to enable Model Viewer to export screenshots to include a shadow which extends off to the right, as well as represent glass on the other side as a transparent layer. But so far I can only export images with a black background the same as the UI icons. Which parameters can enable this function?

I am aware that you can simply export to screenshots using just that button, and how to find them; it's just how the images themselves turn out. The screenshot shown above has the white background around it with the shadow which extends off to the right, where the green arrow is pointing. I have tried this function but the exported images instead have a black background that I need to manually remove with Photoshop, and once I do the aforementioned shadow is nowhere to be seen. Which settings under the options tab would I have to enable in order for the screenshots to display as intended?

I installed GIMP and the transparent background appears to work. However I still can't find the shadow which usually shows up at the lower right of the image (where the green arrow is pointing). Perhaps it has to do with my graphics card, or the selections I made under Options?

These are the options I set when exporting to screenshots; enable shadows is already selected. If I select render environment the image comes out as a tiny square with no objects. Which graphics card are you using? Mine is an NVIDIA GeForce 940MX.