I copy and pasted an object in one blender file and imported it into a motion tracked scene. However, when I click "render image" the motion tracked object (robot) does not show in the render. I made sure that "transparent" was toggled on, and have checked the nodes, yet the object still does not show in the render. Any help will be appreciated. Thanks!
Not a real answer, but did the motion tracked scene render before you imported in the object?
I didn't see anything obviously wrong in the file, but I copied all your collections and created a new scene inside the same file, pasted the collections in there and the renders worked. So something was odd with your scene.
Sorry I don't have a solution for you but copying it into a new scene seems to work, otherwise you could bake the camera to keyframes and just append everything into a new file, that should also work.