1. Analyze Markdown content and extract relevant elements.
2. Determine conversion mode (API or AI) and theme.
3. Generate HTML with inline CSS based on the selected mode and theme.
4. Process images: upload local images, download and upload online images, or generate AI images.
5. Replace image URLs in the HTML with WeChat URLs.
6. Preview the HTML or upload it to the WeChat draft box.
7. If requested, remove AI writing traces and provide a quality score.