Before starting to create a picture frame, you need to select at least a photo.
Click the Select button to select a photo. The (+) button also works.
After selecting, the Select button will become the Create (x) button, where x is the number of photos you have selected.
Click the Create (x) button to start creating the picture frame. The frame will be created and placed at the origin of the current scene.
To add files to the currently selected list, click the (+) button. To clear the current list, right-click the Create (x) button.