Try explaining why sunsets look red on one slide. You might need to show white sunlight, the atmosphere, the longer path at sunset, and the colours that reach your eyes. Put all of that on screen at once and the viewer has to find the part you are talking about.
A short sequence is easier to follow. Show sunlight first. Then extend its path through the air. Let the colour change appear as the narration explains it. The diagram can stay in place between scenes, so the viewer sees what changed.
Write for the ear
A slide title is not a voiceover script. Say the explanation out loud before you build the scene. Sentences that look neat in a document can be hard to follow at speaking speed. Shorten the opening and give unfamiliar terms a moment to land.
Keep the words on screen sparse. A label, a number, or a question may be enough. The narration can carry the explanation while the visual points to the part that matters.
Make the movement explain something
An arrow can show direction. A highlight can draw attention to one part of a diagram. An object moving beside another can show a comparison. If an animation adds no information, it can usually go.
Reuse colours and positions across connected scenes. If the blue arrow meant scattered light a moment ago, it should mean the same thing in the next scene.
Watch it at normal speed
For a first version, try eight to twelve scenes in roughly 90 seconds. Some scenes need a sentence; others need a pause. Watch the whole piece with the sound on, then check it on a phone.
When a scene feels crowded, move one step into the next scene. When the voiceover runs ahead of the visual, change the timing or the script. Dayfaro lets you revise the narration and individual pages in the same chat.