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The script

Edit anything. One line per spoken beat; the video narrates exactly this.

Nothing is ordered yet. Answer it, or skip it and go with what you have written.

Short answers to "what should I type, and which options should I turn on?"

One idea per video. A list of topics gets a thin video; one question gets a deep one. ✗ "Explain light, colour and the atmosphere" ✓ "Explain why the sky is blue"
Say who it is for and what they already know. It changes every example the narrator picks. ✗ "Explain fractions in an easy way" ✓ "Explain dividing fractions to a 14-year-old who can multiply them but has not started algebra"
Give the order, name the analogy, ban what you don't want. The narrator follows all three. ✗ "Cover Ohm's law, make it intuitive" ✓ "Start with why the lights dim, then the water-pipe analogy, then V=IR, then one worked example. No car analogies."
Paste the real thing. The equation, the paragraph, the code. Describing it from memory loses the details the video needs. ✗ "Explain question 4 from this week's problem sheet" ✓ "Explain this, from my problem sheet: find the area between y=x² and y=2x"
Say what to leave out and how to end. Otherwise the video decides for you. ✗ "Explain the Pythagorean theorem" (expect some history and a proof) ✓ "Skip the history, no proofs. End with the two things to remember."
Focus sets how far the video ranges: Tight answers the question and nothing beside it, Exploratory may take a related detour, Balanced is the video you get today. It changes what is included, never how it is taught.

Attach PDFs, notes (TXT, MD) or images. Documents are read in full; images are placed in the video and described. For a specific textbook's approach, attach the chapter: the attachment wins over the narrator's own version.
Tell the video how to use each file. ✗ A PDF attached, nothing said about it ✓ "Follow the attached notes; use figure 2 as the main diagram"

Explainer: one narrator, drawing as it speaks. Best for definitions and walkthroughs.
Socratic: a teacher and a student. Best for misconceptions, reasoning and exam practice; each student question is a place to pause. Pick two voices that sound different.

Technical: axes, equations, precise figures. Maths, physics, code, data.
Whiteboard: clean drawings on a blank page. Processes and general concepts.
Sketch: loose pencil lines, like a notebook. Stories, history, softer topics.
Custom: upload one image and the video copies its medium, line and palette. One clear illustration works best. The reference itself is never drawn into the video.
Web images adds photographs and real diagrams from open sources. On for anything physical or historical; off for a purely drawn or abstract video.

The whole video is narrated in the language you pick. Write the brief in whichever language is easiest for you.
Tone sets how the narrator talks: Casual is a friend at the board, Formal is a lecture hall, Neutral is the video you get today. It changes the words, never the look or the length. In a dialogue it is the teacher's voice.
Silent video, the first entry in the voice list, makes a video with no narration. The drawings and on-screen text carry it, so put the words you want on screen in the brief. ✗ "Explain the water cycle" (silent) ✓ "Explain the water cycle. On screen: evaporation, condensation, precipitation, one label per stage."

Narration runs at about 150 words a minute. One idea fits in 45 to 90 seconds; a full worked example needs two to three minutes.
Let AI decide reads your brief and picks a length. The length bar stops at the longest video your plan renders.

Web images, Questions, Personalized, Tone and Focus sit under Duration. Language and Orientation are open on every plan. These five depend on your plan, and anything your plan does not include stays at its default: Web images, Questions and Personalized off, Tone on Neutral and Focus on Balanced.
Questions asks you one short thing about your brief before anything is drafted or rendered, whichever button you press. Answer it, or skip it from the card. It comes with Pro, where you can also switch it off here; off, nothing is asked, before the render or during it. Switching it off never throws away an answer you have already given.
Personalized shapes the video around your profile: how you learn, what you already know, and your first name. Switch it off when the video is for somebody else, like a class, a colleague or an audience. Nothing about you reaches that video, and it is never asked about you either. Whether a personalized video uses your name is a separate setting, under First name in Settings. It comes with Pro; on other plans it stays off.
Horizontal for classrooms, slides and laptops. Vertical for phones and short-form feeds.

The button beside Generate drafts the narration for you to read and edit before the video is ordered. Drafting comes with every paid plan, with no daily limit. Use it when exact wording, names or terminology matter.
Drafting waits for a worker with no paid video rendering, so it can take a few minutes. If every worker is busy just then, try again later or use Generate to render straight away.
One line per spoken beat; the video narrates exactly what you approve, and the render asks no questions about an approved script. No drafts for silent videos, or past ten minutes or your plan's own longest video, whichever is shorter.

With Questions on, if the brief leaves a real choice open, the render pauses and asks. Answer on the watch page, or leave it and it decides.