Step 1 - Launch your Home Page > Click Edit with Elementor.

 

Step 2 - Once you're inside the Elementor Section, click the little 6-dotted icon.

 

Step 3 - By clicking the little 6-dotted icon, it will lead you here. Inside the Edit Section, go to Style > Background Type (follow the box in the image below). Choose your images (upload as many as you can). Don't forget to click Update.