Hi @babiskalogirou
Thank you for reaching out!
If you do not add any image to the product, a default thumbnail will be shown on the single product page.
Here is a screenshot: https://d.pr/i/TSHVlt
Can you please let me know if no thumbnail is showing for your website when there is no image added for a product?
Hi there @babiskalogirou 👋
By saying “thumbnails” i mean the little images under (if horizontal) the main image. When i attach additional images, then these little images appear.
When the only image is the featured image, then it does not
From the provides example products, it appears that in this scenario a product image is set, while in this one not.
The placeholder image (as it is called) can now be set at: WooCommerce > Settings > Products as of WooCommerce version 3.5x.
Here is how the setting looks: https://snipboard.io/G7BN3X.jpg
Feel free to set the site logo or another suitable image there, for it to appear on all products without a product image set.
I hope this helps!