Upload your slides → review the narration script drafted by the system → build a short narrated video (English narration, bilingual subtitles) using your own voice-service key. Your key is used once and never stored. 上传幻灯片 → 确认讲稿 → 用您自己的语音服务密钥生成短视频。密钥仅本次使用,绝不保存。