If you’re using the full URL of the images, then the importer may be “downloading” the images again. If you remove everything but the image name, like dog-cat.jpg, it would fix the issue.
Oh, it works. Thank you so much 😀
Could you try with a complete path? – e.g. https://yoursite.com/wp-content/2021/08/dog-cat.jpg
of course, I use full URL, that’s just my example 🙂