When it comes to Webstudio project thumbnails to my knowledge it grabs it from the image of the index page. This feature just doesn't work if you select "Include in marketplace". General project settings in the area I provided with the screenshot could go a long way improving the experience. While I am aware there are project settings when you select the project, they do not include setting a project thumbnail. Maybe just adding the thumbnail feature into that section could help but I digress.
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