graph TD A[Start: Create Promotional Video] --> B[Gather Initial Inputs] B --> C1[Short Script Creator] B --> C2[Music Curator] C1 --> D1[short-promotional-script] C2 --> D2[short-bgm-wav-files] D1 --> E1[B-roll Finder & Editor] D1 --> E2[Overlay Instruction Generator] E1 --> F1[trimmed-vertical-broll] E2 --> F2[text-overlay-plan] D2 --> G[Base Video Creator] F2 --> G G --> H[text-slide-mp4] H --> I[Final Video Assembler] F1 --> I I --> J[final-promotional-short-mp4] J --> K[End: Complete 10-15s Vertical Video]