Hi, you can select a photo on the wall by walking up to it and left clicking. Next, you can press 1 too hold up the photo, and 2 to hold up the camera. Last, you can left click while holding up the camera to take a picture.
You should be able to hold up a photo at the same time as the camera, assuming you have a photo selected from the wall. If you're unable to, then that's definitely a bug.