Subject: Bug Report — File Delivery Link/Attachment Fails in Chat Image-Processing Flow Priority: High Summary: Users are unable to receive edited image files through the chat. Links provided (sandbox/local paths) are not clickable or downloadable, and attachments are not delivered through the interface. This blocks completion of image-editing tasks where the assistant produces and returns image files. Steps to Reproduce: User uploads an image and requests an edited output (e.g., circular-cropped PNG, 512×512). Assistant processes the image and reports that the file is ready. Assistant provides a download link using a local/sandbox path (e.g., sandbox:/tmp/filename.png) or attempts to attach the file. User cannot click the link and does not receive an attachment. Observed Behavior: Provided sandbox/local links are not actionable/clickable in the chat UI. Files are not attached or delivered to the user; attachment attempts appear to fail silently. Users are offered Base64 as a fallback, which is less convenient. Expected Behavior: Attachments generated by the assistant should be delivered to the user reliably via the chat interface. Download links provided by the assistant should be valid and accessible (or the assistant should automatically attach the file). If direct file delivery is not supported by the platform, the assistant should detect this capability and immediately provide an alternative (Base64 or a secure external upload) without first offering non-functional links. Impact: Prevents users from receiving edited images or other generated binary outputs. Causes user frustration and repeated back-and-forth. Reduces trust in the assistant’s ability to complete media-editing tasks. Suggested Fixes / Mitigations: Capability Detection: Have the assistant detect whether the chat platform supports file attachments and actionable links before presenting them. If unsupported, automatically provide the Base64-encoded file or an alternative delivery method. Attachment API: Implement or enable a secure file-attachment API endpoint that the assistant can use to upload generated files and return stable, time-limited download URLs accessible to users. UI Hinting: Make sandbox/local paths non-presented to users; instead show a clear “Download” button or link generated by the platform that opens the file. Fallback Workflow: Standardize a fallback workflow where, if direct attachment fails, the assistant immediately offers Base64 data, or uploads the file to a secure temporary storage (with expiration) and returns that link. Error Feedback: Provide clear error messages to the assistant indicating whether an attach/upload attempt succeeded or failed, so the assistant can take corrective action automatically. Logs / Examples: User session where assistant offered "sandbox:/tmp/coffee_fellows_circle_512.png" and repeated attempts to attach failed. Several exchanges where assistant acknowledged inability to attach files and offered Base64 as fallback. Requested Action: Please investigate and implement one or more of the suggested fixes so generated files can be reliably delivered to users in chat. If the platform intentionally blocks attachments, update assistant behavior to immediately use the supported fallback (Base64 or external upload) and clearly inform the user. If you need the conversation transcript or a specific example session ID, I can provide it.
