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However, apart from the one thumbnail that shows up here on Steam Workshop, you can also add video and different screenshots or images to that item. You can find that option within the steam workshop title page. Hope this helps.
If you follow the instructions, just re-upload the Workshop, if it has a generated ini file from the workshop already, Steam will update the data and your Thumbnail will be there. Just make sure your file is not more than 2MB or Steam will reject the file