I had a similar issue.
The revolution slider shows in the edit but does not appear on the page. So, I have tried the above mentioned and it did not work for me. The official Revolution Slider widget did not work, the Elementors shortcode widget did not work.
I made it work by inserting a new Elementors <HTML> widget and pasted the shortcode inside. IT WORKED!
Then you can play with the top margin to make it look like it is a slider image.
THE REVOLUTION SLIDER IS THE BEST!
