I am having this issue. Uploaded image files to proper product image and thumbnails folders, made and uploaded the CSV file, and none of the product pages are showing the images.
It would be infinitely more helpful if your sample CSV file had examples of all of the available fields. I’ve got nothing to compare my file to to know if I’ve made it correctly in respect to the thumbnails. Furthermore, when I go into the Deluxe Importer, there are no dropdowns to match the CSV to the respective fields, like thumbnail width or thumbnail height.