Developed Feishu video media handling for mobile messages in the openclaw/openclaw repository, focusing on backend reliability and robust API integration. The work centered on processing video files sent via the 'media' message type, enabling accurate downloads and placeholder inference for downstream systems. By addressing the nuances of Feishu’s mobile client media formats, the implementation reduced download failures and improved the user experience within the Feishu channel. The solution was delivered using TypeScript and backend development best practices, laying the groundwork for future media-type abstractions and ensuring clear commit traceability for ongoing maintenance and integration enhancements across channels.