Editing a Smart Object After you open PSD file you will see all objects properly grouped and named.
To insert your design you need to edit Smart Object. To do so, follow 3 simple steps:
1. Select the Smart Object from the Layers Panel
2. Choose Layer > Smart Objects > Edit Contents
3. A new blank file will open, insert you design, then choose File > Save
After those steps your design will appear automatically upon returning to your main psd file.