[merge portrait image on Landscape image]

Thankyou so much for the help.

[merge portrait image on Landscape image]

Thanks for the reply, I tried the steps you suggested but I am still facing issues. The background that i selected is landscape and the foreground is portrait. When i try to merge these 2 either the backgrounds gets cut off or is too small in canvas

[merge portrait image on Landscape image]

I downloaded an image from internet which is Landscape in orientation. I have an image with greenscreen and thats in Portrait orientation.

 

I resize the canvas and  import the landscape oriented image(this looks good). Now when I import the second image which is potrait orientation the canvas size now is as the portrait image and the first image is too small and displayed on top lext of the canvas. How can superimpose a portait image on landscape? Is there any image resolution restriction that i shoul dbe taking care off? Please suggest.