Creating a WP Flow Plus carousel from a NextGen gallery is an ideal way to achieve great results. With the NextGen plugin you can perform bulk image resizing, and regenerate thumbnails in any size. The WP Flow Plus carousel will use the thumbnail size for the carousel images, and the full size for the Lightbox images.
STEP 1 – Create a NextGen Gallery and upload images
STEP 2 – Optionally edit your gallery on the NextGen manage galleries page. Here you can bulk edit image sizes, regenerate thumbnails, and update the image alt & title text
STEP 3 – Edit the page/post that will contain the WP Flow Plus carousel
STEP 4 – Insert the shortcode using the WP Flow Plus shortcode generator, selecting the NextGen image source and the appropriate gallery name, optionally select starting image and rotation.