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Microsoft Agent Builder accepts files up to 512 MB for grounded agents
Focus: Agents for Non-Technical People
Date: August 25, 2026
Topics: No-code agents, grounding, large files, domain knowledge, RAG
Evidence: Unspecified
Availability: Unspecified
Summary: Microsoft’s latest Microsoft 365 Copilot release notes say Agent Builder now accepts file uploads up to 512 MB on Android, iOS, Windows, and the web. Makers can use larger manuals and other documents as grounding sources without first splitting or compressing them.
Why it matters: Larger uploads reduce a practical barrier for non-technical agent creators working with manuals, policies, course materials, and application documentation. File capacity does not guarantee retrieval quality: builders still need authoritative sources, clear document structure, representative tests, citation checks, and a process for replacing outdated material.
Original commentary: This directly supports project-specific assistants grounded in book manuscripts, user guides, or application documentation. A course exercise should test answerability, conflicting sources, missing information, citations, and update behavior before the agent is trusted.
Source: Microsoft 365 Copilot release notes