1. Open a project.
2. Tap the 3 dots in the upper right corner.
3. Choose Select Photos
4. Tap the small circle that's showing on each photo at the upper left corner of each photo
5. After you have selected the photo(s) you want to move, tap the 3 dots in the lower right corner
6. Choose Move Items
7. Search for the Project tap to select the project and then confirm by tapping Move