A tour does not have to start from photos. Step 01 also offers the clips already in your account, so if you have scenes you like from earlier tours you can stitch a new video out of them without animating anything again.
Where the clips are. They sit in the same grid as your photos on Step 01, sorted in with them by date. The Clips filter in the toolbar above the grid narrows the grid to clips only, which is the fastest way to find them in a large library.
Reusing a clip is free. A clip you already own is already rendered, so nothing is generated and nothing is charged. Where a tour built from photos spends credits animating each scene, a tour built from clips spends none: the only work left is stitching them together.
The first thing you pick decides the tour. Pick a photo first and the tour is a photo tour. Pick a clip first and it is a clip tour. The two do not mix, so once there is something in your tour the other kind greys out, and a greyed tile tells you why when you hover it. Nothing is hidden from you, and anything already in your tour stays live so you can always take it back out. Empty the tour and both kinds are on offer again.
Motion is skipped. Step 02 is where a photo is given a camera movement. A clip already has one, so a clip tour goes from Select straight to Opening.
The clips set the shape. You pick an orientation before the builder opens, but a clip is already rendered at its own, and cropping a finished video cuts the sides off it. So the first clip you add decides the tour instead: a 16:9 clip makes the tour landscape, a 9:16 clip makes it vertical. A clip in the other shape greys out and says so.
Everything else works the same. Your Opening and Closing cards, pacing, naming, and the Review summary are unchanged, and the same twelve-scene limit applies. Step 05 lets you play each clip before you commit, reorder them, drop one, or add another.
This is also the easiest way to re-cut a tour you already paid for: start a clip tour, pick the scenes that worked, and give them a new opening, a new closing, and a different pace.