Help! I cannot move my pictures into a collection or a slid show that I am creating. What am I doing wrong?
Please provide us more information.
Also ensure that the image you are trying to move is not missing from Lightroom.
Are you doing a drag and drop within Lightroom? If so, your drag needs to begin when you hold the mouse button down while pointing at the middle of the photo, and not pointing at the grey surrounding the photo.
If that's not it, then please explain in great detail exactly what you are doing.