Taking note of the feedback. But I'm also testing it and it lets me import multiple dragons I made before at once (it also generates the code to export automatically once you click the save button), is there a different way it's giving you trouble?
If you mean import different designs during the same game session, it should let you do it, by replacing the code in the box and clicking the Load Design button, and you can replace that code with other designs you have saved as many times as you want.
If you mean having multiple dragons visible in the same scene, the previous importer didn't allow that either am afraid.