How to duplicate a layer AND change the photos in these layers
Hello,
First of all, I am totally new to After Effects.
I have a slideshow in After Effects and in this slideshow there are several layers which show different photos. But 1 layer has photos in a landscape size and the other layer has photos in a portrait size. Now I want all layers to have landscape sizes. So I copied (or duplicated) a layer with a landscape sized photo. But when I change the photo in that layer, the photo in the original layer also changes into that photo. And that is not what I want. I want the photo in the original layer to stay the photo it had.
I hope I can make clear what I want (because English is not my native language).
Anybody who knows how to do this?