I think I have found the solution to this problem that Elementor is presenting in its latest versions (1.8.1 and 1.8.2), Elementor is simply reinstalled in the previous version 1.8.0, which worked for me, allowing importing templates without problem. It only remains to hope that the very efficient creators of Elementor, adjust this small problem in new versions. Sorry for the translation (google) since I do not speak English very well. Good luck
