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The image E2E now runs in the main conversation, which is a group thread, so the browser test covers group uploads and reads from the artifact route as well as bot threads. Bot file attachments keep their run's operation id for tracing, and the non-streaming attach cap is the inline cap directly. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MRtGG9ARfqqhma3t85Ro2u