troubles with premiere pro and photoshop files

So I have seen the new function where you can create backgrounds with adobe photoshop with the ai tool which is amazing. When I drag the file into premier pro and try to merge the original video with the new background it does not work, or it works, but it becomes just a picture and the video do not play, and keep in mind that like the dimensions of the photoshop file and the original premiere pro video is the same?