openclaw - 💡(How to fix) Fix WhatsApp: HTML files silently fail to attach as documents [1 comments, 2 participants]

When sending an HTML file via the message tool with action=send on WhatsApp (baileys provider), the file is not attached — only the caption/text is delivered. No error is returned by the gateway; the send appears successful.

Fix Plan

To fix the issue of HTML files not being attached when sent via the message tool with action=send on WhatsApp (baileys provider), we need to modify the mime type handling for HTML files.

Here are the steps:

• Set the mimeType to application/html or a custom mime type that WhatsApp supports for document attachments.
• Ensure the filename includes the .html extension to help WhatsApp identify the file type.
• If necessary, modify the baileys provider or OpenClaw WhatsApp adapter layer to handle HTML files as document attachments.

Example Code

// Set the mimeType to application/html
message({
  action: 'send',
  channel: 'whatsapp',
  target: '<number>',
  filePath: '<path-to-file.html>',
  filename: 'test.html',
  mimeType: 'application/html'
});

Verification

To verify the fix, send an HTML file using the modified code and check if the file is attached and delivered correctly. If the issue persists, try modifying the baileys provider or OpenClaw WhatsApp adapter layer to handle HTML files as document attachments.

Extra Tips

• Ensure the WhatsApp Web API supports the custom mime type used for HTML files.
• Test the fix with different HTML files and WhatsApp clients to ensure consistency.
• Consider adding error handling to catch any exceptions that may occur during file sending.