Challenges with File Uploads in MCP: Claude vs. ChatGPT
Sbrady1234 · reddit · 2026-08-29
The author discusses the challenges and current practices of implementing file uploads within the MCP (Model Context Protocol).
Problem Context:
- AWS S3 pre-signed URLs work in Claude (with egress permissions) but seem unsupported in ChatGPT.
- The author built a web app for uploads, returning links via MCP, but the agent often fails to understand the workflow, resulting in a clunky experience.
The author is seeking community best practices and open-source solutions that solve this effectively.
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