How to use existing remote assets in new content

Hi!

I have a website that I'm porting to Drupal which currently uses Rackspace to store their assets. I have access to Rackspace's UUID from those assets. The Flysystem Rackspace module wasn't working correctly and I managed to get it working with a patch I contributed, but now I'm struggling with a different issue.

As I'm preparing to migrate (recreate) their content programmatically, I need to know if there is any way of using that UUID when creating content in Drupal, without having to download the file, create a managed version of it which Drupal knows of and can use and end up replicating the file remotely.

Any help would be great as there's a ton of data and this process will be very long and intensive.

Thanks in advance!