I just tried to capture a thumbnail. It works - but I had to expermient a little. Here’s my how to:
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Go into “Dev Mode”.
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Open the hangar.
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Load aircraft and livery of your choice.
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Open the aircraft thumbnail capture tool and load pre-defined groups like that (“add preset” on the bottom).
I recommend experimenting with the presets to obtain thumbnails you like. I prefer to have them like the Asobo ones. So I just setup my active group for a 4K resolution with option “Render ground” marked.
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Click on “Capture” all the way on the bottom.
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A windows file dialog opens: choose where you want the thumbnails to be stored. (It’s a .png!)
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If you fancy, you can choose another angle of view before capturing.
In the end I use this tool to generate the correct thumbnails: Default thumbnail & layout.json generator » Microsoft Flight Simulator
Kind regards
Marcel