Hi Jean,
We have already tested the Integrity site and it imported succesfully at our end. It might be something is blocking at your end and that we need to investigate through the WordPress admin dashboard.
If it is not possible to share the credentials, I would suggest you to check the following points once.
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Please check if the mod_security is enabled in your site, which causes the issue in importing and does not let you call the Cornerstone endpoint to import the Design Cloud assests.
And if that is the case, you need contact your hosting service provider to temporarily disable the ModSecurity for you and make the Cornerstone endpoints whitelisted.
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The write permission to the uploads folder might be one of the reason behind your issue, I would suggest you to change tha permission to import the images into it.
If the above does not help, please copy your live site to a staging server and give us access in the secure note for further investigation.
NOTE: I have also investigated your site, and found that neither X or Pro or Cornerstone is installed currently at your end.
Hope it helps.
Thanks