Brian Lee enhanced the margelo/expensify-app-fork repository by delivering four targeted documentation features focused on improving user onboarding and reducing support friction. He updated Markdown-based guides to clarify Canadian EFT routing number requirements, emphasizing the need for leading zeros, and restructured onboarding documentation to align with a mobile-first product strategy by removing desktop references. Brian also revised two-factor authentication and account recovery links to ensure users accessed current resources, and clarified the American Express production file submission process. His work demonstrated strong technical writing and content management skills, resulting in clearer workflows and more efficient user support without introducing new bugs.