For importing the Elementor mega menu template you must install the Pro version of Elementor plugin and activate Elementor new features. Lastly, you need to follow these steps to import Elementor templates.
Step 1: Make sure you have latest Elementor Pro version.
Step 2: Activate all Elementor new features such as Gird, Menu and Containers. Go to Elementor > Setting > Features tab.
Step 3: Now click on Templates > Saved Templates and Click on Import Templates. Upload json file. Done
Import Elementor Mega Menu
Copy and Paste Elementor Mega Menu Section
Step 1: Import multiple mega menu templates into the templates section.
Step 2: One by one, click “Edit with Elementor” and open each template in a new tab.
Step 3: Once open in Elementor, copy sections and elements into your preferred mega menu templates.