Assets

Try a sample
Optional. With one it becomes image-to-video; without, it is pure text-to-video
Try a sample
Optional. Given alongside a first frame, the model fills in the transition

Prompt

Cover subject, action, camera movement and light. Camera instructions land better as their own clause

Settings

Duration
Only 5 or 10 seconds. Billed per job, so both cost the same
Mode
Pro looks better and takes longer. Billed per job, so both cost the same
Aspect ratio
With a first frame the ratio follows it and this setting is ignored
Prompt adherence
Higher follows the prompt more literally, lower gives the model room
1 generation
My generations0