openclaw - 💡(How to fix) Fix Control UI web: image attachments not received by agent [1 participants]

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openclaw/openclaw#60105Fetched 2026-04-08 02:36:11
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Bug Description\nWhen sending images via the Control UI web chat (http://localhost:18789/), the agent does not receive the image. The image data appears to be lost during WebSocket transmission.\n\n## Steps to Reproduce\n1. Open Control UI web chat at http://localhost:18789/\n2. Try to send a screenshot/image by dragging and dropping or pasting into the chat input\n3. The agent does not receive the image\n\n## Expected Behavior\nImages sent via Control UI web chat should be received by the agent, similar to how images work via Feishu channel.\n\n## Environment\n- OpenClaw version: (latest)\n- Browser: Chrome\n- OS: macOS\n- Channel: webchat (Control UI web)\n\n## Additional Context\n- Images sent via Feishu channel work fine and are received correctly\n- The issue is specific to the Control UI web interface\n- Sometimes screenshots sent via Feishu workaround are needed to debug

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Bug Description\nWhen sending images via the Control UI web chat (http://localhost:18789/), the agent does not receive the image. The image data appears to be lost during WebSocket transmission.\n\n## Steps to Reproduce\n1. Open Control UI web chat at http://localhost:18789/\n2. Try to send a screenshot/image by dragging and dropping or pasting into the chat input\n3. The agent does not receive the image\n\n## Expected Behavior\nImages sent via Control UI web chat should be received by the agent, similar to how images work via Feishu channel.\n\n## Environment\n- OpenClaw version: (latest)\n- Browser: Chrome\n- OS: macOS\n- Channel: webchat (Control UI web)\n\n## Additional Context\n- Images sent via Feishu channel work fine and are received correctly\n- The issue is specific to the Control UI web interface\n- Sometimes screenshots sent via Feishu workaround are needed to debug

extent analysis

TL;DR

Investigate the WebSocket transmission in the Control UI web chat to identify why image data is being lost during transmission.

Guidance

  • Verify that the image data is being sent correctly from the client-side by checking the browser's developer tools for any errors or issues with the WebSocket connection.
  • Compare the WebSocket transmission implementation in the Control UI web chat with the Feishu channel to identify any differences that could be causing the issue.
  • Check the server-side logging to see if there are any errors or issues with processing the image data received over WebSocket.
  • Test the Control UI web chat with a different browser or OS to see if the issue is specific to Chrome on macOS.

Example

No code snippet is provided as the issue does not contain enough information to create a specific example.

Notes

The issue seems to be specific to the Control UI web interface and does not occur when using the Feishu channel, which suggests that the problem may be related to the implementation of the WebSocket transmission in the Control UI web chat.

Recommendation

Apply workaround: Use the Feishu channel for sending images until the issue with the Control UI web chat is resolved, as it is currently the only reliable method for sending images.

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