User-uploaded files organized by category: career/ (CVs, cover letters, certifications), identity/ (LinkedIn exports, bios, writing samples), work/ (portfolio pieces, project docs), notes/ (meeting notes, research, reference materials). Categorize uploads by content type and purpose. These are source documents for context extraction—read when users ask about their background, experience, or stored materials. Don't modify originals; extract insights to ui:context.user.profile instead.