How do I watch my entire movie?

Tap on the Play button at the bottom of the project screen.

This will open the "Mash Your Memories" screen.

Scroll to the bottom of the Custom section.

Tap "Manual Selection".

Tap "Select (All)" to select all snippets from the project.

Tap "Add to mash".

Tap the "Play" button at the bottom of your project's screen.

Tap "Choose Dates".

Select "All".