If you are in the middle of creating a project and want to add more pictures not previously selected into your project, you have a few methods to achieve this goal. 

Photos already inside your Apple Photos Library

  1. Select (highlight) a single, or multiple photos while within your Apple Photo Library (or albums)
  2. Drag them into the project you are creating under "My Projects".
  3. When you open your project back up again, you will see that the new photos have been added to your photo selector tool

Photos NOT already inside your Apple Photos Library

  1. Select the photo from your finder, desktop, external drive
  2. Drag them into the project you are creating under "My Projects".
  3. When you open your project back up again, you will see that the new photos have been added to your photo selector tool

Note: Do you want photos you added to your project to also import into your library? Ensure you change this setting (method 1, use 'select) prior to importing the photos into your project.

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