Worked on enhancing the robustness of file upload handling in the Symfony framework, specifically within the symfony/symfony and symfony/http-kernel repositories. Focused on backend development using PHP and Symfony, the developer addressed edge cases where empty file uploads previously triggered HTTP exceptions for non-nullable arguments without default values. By refining the MapUploadedFile logic, the implementation now returns an empty array for array-type arguments and null for others, aligning with argument nullability and default value semantics. This approach improved consistency across repositories, reduced runtime errors, and delivered a more reliable file upload experience for API consumers and end users alike.