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Comments can currently support up to 3 attachments.

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Request format (input)

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Object properties

After following the Working with files and media guide, provide an array of objects under the attachments parameter in the Create comment API, each containing the following properties:
ParameterTypeDescriptionExample value
file_upload_idstring (UUID)ID of a File Upload with a status of "uploaded""2e2cdb8b-9897-4a6c-a935-82922b1cfb87"
typestring (optional)Possible type values are:"file_upload""file_upload"
Example Create Comment request: 
{
  "parent": {
    "page_id": "d0a1ffaf-a4d8-4acf-a1ed-abae6e110418"
  },
  "rich_text": [
    {
      "text": {"content": "Thanks for the helpful page!"}
    },
  ],
  "attachments": {
    "file_upload_id": "2e2cdb8b-9897-4a6c-a935-82922b1cfb87"
  }
}
In the Notion app, when viewing a comment uploaded using the API, the user experience is automatically customized based on the detected category of the file upload. For example, uploading a .png file displays your attachment as an inline image instead of a regular file download block.

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Response format (output)

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Object properties

The response of Comment APIs like Create comment contains attachments with the following fields:
FieldTypeDescriptionExample value
categorystring (enum)The category of this attachment. Possible type values are: "audio", "image", "pdf", "productivity", and "video""audio"
fileobjectA file object containing type-specific configuration.{"url": "<https://s3.us-west-2.amazonaws.com/...">, "expiry_time": "2025-06-10T21:26:03.070Z"}
Example attachment object in Create Comment response: 
{
  "category": "video",
  "file": {
    "url": "https://s3.us-west-2.amazonaws.com/...",
    "expiry_time": "2025-06-10T21:26:03.070Z"
  }
}
The file.url is a temporary download link generated at the time of retrieving a comment. See the guide on Retrieving existing files to learn more about accessing the files you upload.