import_file_error: Remote server did not respond

We have an ecommerce site that’s live now, hosted on myhosting, built about 3 years ago. DNS points to the live site.

We’re building a new version of the site, on a different host (siteground). It is not live. Can’t make it live (e.g., update DNS) until it’s fully functional.

Would like to import blog posts (216 published, 2 draft) with images, from the current site to the site under development.

Tried and get the error message: import_file_error: Remote server did not respond)

I’m guessing it has something to do with the sites being on two different servers (and hosts) and that the site we are importing IN TO is NOT up on a DNS yet.

Thoughts how to make this work would be greatly appreciated!
Thanks!

https://www.ads-software.com/plugins/attachment-importer/