If __messages__ doesn't include the assistant's prior file attachments
(which is what the screenshot is showing), the new fallback queries
the chat by id via Chats.get_chat_by_id and walks every persisted
message for files. Open WebUI's socket handler always upserts files
onto the assistant message via {'files': files} so this path is
authoritative.
The 'No image found' return now includes diagnostic counts —
__files__, __messages__, messages_with_files, chat_id_present,
openwebui_runtime — so subsequent failures actually show what the
tool saw instead of being opaque.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
William Gill
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