UNSUPPORTED_ATTACHMENT_TYPE

HTTP status	Retryable
`415`	No

What happened

The file type is not supported, or not supported by the service the message is going out on.

How to fix it

Send a supported type. iMessage accepts most safe file types; RCS and SMS/MMS accept images and videos.

Example response

An illustrative example. The message wording and the contents of details vary; branch on error.code.

{
  "status": "error",
  "error": {
    "code": "UNSUPPORTED_ATTACHMENT_TYPE",
    "message": "Unsupported file type",
    "type": "validation",
    "http_status": 415,
    "retryable": false,
    "doc_url": "https://docs.blujay.io/errors/unsupported-attachment-type",
    "details": []
  },
  "trace_id": "trc_8f2a1c0e4b7d",
  "timestamp": "2026-10-14T17:30:48.000Z"
}

Still stuck?

Email support@blujay.io with the trace_id from the error response. See Errors for the response format.

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UNSUPPORTED_ATTACHMENT_TYPE

What happened

How to fix it

Example response

Still stuck?

​What happened

​How to fix it

​Example response

​Still stuck?

What happened

How to fix it

Example response

Still stuck?