If you wonder why, after adding all variant images to your product, the images are not showing in the product selection step of your bundle page, then here's what you can do:
To sort this out, please make sure that you’ve selected the "Variant dropdown menu" in your bundle’s product step settings instead of the "Display variants separately" option.
With the Display variants separately option, each product variant will have its own item available for selection. Therefore, it will only display one image for each item listed in the product selection step.
With the Variant dropdown menu option, this will display one item per product, however, there would be a dropdown menu for you to check the product variants. With this option selected, all product variant images will be displayed and will be shown in a carousel.
Please reach out to our support team if you have more questions.