The Autofill feature appears on the Editor, use it to quickly add multiple photos to your slideshow.
Choose a template from our catalog and click Personalize to enter the editor.
Add photos to the photo well by clicking +Add photos on the photo well.
After you added your photos to the editor, click on Autofill on the right toolbar on the editor.
Your photos will appear on your slideshow. You can then re-order them if you choose to.