Many Magento 2 stores sell products with multiple custom options to satisfy customers by various selections. And each time you want to add options to product, do you have to create one by one? Can’t you add thumbnails for custom options?
Why don’t you install an advanced product custom options for Magento 2? It will help you solve these problems easily. You can refer this
article Top 10 Magento 2 Custom Options Extensions Free and Paid to get more information.