Klevu module is designed in a way that if some new images are updated from Magento admin, it automatically synced to Klevu on next Cron. If the images are uploaded directly on the server using some third-party module or ERP system, the image name is not changed.
In this case, Klevu is not able to detect this change and is not able to index the new images to the Klevu backend. To handle this, it will require to regenerate images in the Klevu Images directory.
Here are the instructions:
Please put the file attached on the root of Magento and execute it using CLI.
Please execute the following command on CLI:php bin/magento klevu:images --regenerate