Motif does not currently support converting an Apple photo project into a Motif project.
The exciting news is Motif is shortly releasing a new feature that will convert existing Apple photo book projects into Motif photo book projects. This advanced feature will transfer almost all of Apple’s thematic content, page layouts, images, maps, text, colors, and borders with a high degree of accuracy.
This feature will be included in Motif’s next major release in 2018. As always, you can find and download updates to Motif from the Mac App Store.