🐛 Issue: Cannot remove inline keyboard (attachments) when editing message

[vanovarderesyan]

Hi 👋

Thanks for maintaining this node — it’s very useful for integrating MAX bots into n8n 🙌

I’m encountering an issue when trying to remove inline keyboard buttons (attachments) after editing a message.

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❗ Problem

When using the Edit Message operation in the MAX node:

• Updating the text field works correctly
• However, existing inline keyboard buttons remain attached to the message
• There is no reliable way to remove them via the node

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🔁 Expected Behavior

According to the MAX API:

• Sending:

"attachments": []

should remove all attachments (including inline keyboard)

• Sending:

"attachments": null

or omitting the field should keep existing attachments

After editing, the message should no longer display buttons.

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🧪 Steps to Reproduce

1. Send a message with inline_keyboard (Approve / Reject buttons)
2. Capture mid (message_id)
3. Use MAX node → Edit Message
4. Try to remove buttons:
   • Set attachments to []
   • Or use expression: {{ [] }}

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📌 Actual Behavior

• Node throws error:

The value "[Array: []]" is not supported!

OR

• Edit succeeds but:
  • attachments are not sent
  • previous buttons remain visible

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🔍 Root Cause (likely)

It appears that:

• The node does not support array-type input for attachments
• Or it does not serialize empty arrays properly
• Or it skips sending attachments when empty

As a result, MAX API treats the request like:

{
  "text": "Updated text"
}

Which keeps existing attachments.

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🔧 Workaround

Using a raw HTTP Request node works correctly:

PUT https://platform-api.max.ru/messages?message_id=mid.xxxxx

{
  "text": "Updated text",
  "attachments": []
}

This correctly removes inline keyboard buttons.

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💡 Suggested Fix

It would be great if the MAX node:

• Supports attachments as an array input
• Properly sends attachments: []
• Does not convert arrays into invalid strings like [Array: []]
• Or provides an option:
  • "Clear attachments"

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📎 Additional Context

• Use case: approval flow (Approve / Reject buttons)
• After user clicks → message should update and buttons should disappear
• This is a standard chatbot pattern (similar to Telegram inline keyboards)

---

🙏 Thanks!

Happy to provide:

• request/response logs
• workflow export
• additional testing

[pfrankov]

Thanks for the clear report. You were right, this was a real issue.

MAX keeps existing attachments when attachments is omitted, and removes them only when attachments: [] is sent. The node didn’t expose a way to send that empty array from Edit Message.

Fixed in v0.1.21: there is now a Clear Attachments option in Edit Message. Enable it to remove the inline keyboard/buttons while editing the message.