post/channels/{channel_id}/attachments

Request presigned attachment upload URLs

Returns presigned upload URLs for message attachments in the target channel. Small files (<=10MB) return a singlepart PUT URL; larger files return a multipart plan (upload_id + per-part URLs) that the client should complete via the matching /attachments/complete endpoint. Requires message send and attachment permissions in guild channels.

request_presigned_message_attachment_uploads

Parameters

Name	In	Type	Description
channel_id*	path	SnowflakeType	The ID of the channel

Request body

application/json

json

{
  "type": "object",
  "properties": {
    "attachments": {
      "type": "array",
      "items": {
        "$ref": "#/components/schemas/PresignedAttachmentUploadRequestItem"
      },
      "minItems": 1,
      "maxItems": 10,
      "description": "Attachment upload specifications"
    }
  },
  "required": [
    "attachments"
  ]
}

Responses

200

Success

json

{
  "type": "object",
  "properties": {
    "attachments": {
      "type": "array",
      "items": {
        "$ref": "#/components/schemas/PresignedAttachmentUploadResponseItem"
      },
      "description": "Presigned upload details for each attachment"
    }
  },
  "required": [
    "attachments"
  ]
}

400

Bad Request - The request was malformed or contained invalid data

json

{
  "type": "object",
  "properties": {
    "code": {
      "$ref": "#/components/schemas/APIErrorCode"
    },
    "message": {
      "type": "string",
      "description": "Human-readable error message"
    },
    "errors": {
      "type": "array",
      "description": "Field-specific validation errors",
      "items": {
        "$ref": "#/components/schemas/ValidationErrorItem"
      }
    }
  },
  "required": [
    "code",
    "message"
  ]
}

401

Unauthorized - Authentication is required or the token is invalid

json

{
  "type": "object",
  "properties": {
    "code": {
      "$ref": "#/components/schemas/APIErrorCode"
    },
    "message": {
      "type": "string",
      "description": "Human-readable error message"
    },
    "errors": {
      "type": "array",
      "description": "Field-specific validation errors",
      "items": {
        "$ref": "#/components/schemas/ValidationErrorItem"
      }
    }
  },
  "required": [
    "code",
    "message"
  ]
}

403

Forbidden - You do not have permission to perform this action

json

{
  "type": "object",
  "properties": {
    "code": {
      "$ref": "#/components/schemas/APIErrorCode"
    },
    "message": {
      "type": "string",
      "description": "Human-readable error message"
    },
    "errors": {
      "type": "array",
      "description": "Field-specific validation errors",
      "items": {
        "$ref": "#/components/schemas/ValidationErrorItem"
      }
    }
  },
  "required": [
    "code",
    "message"
  ]
}

429

Too Many Requests - You are being rate limited

json

{
  "type": "object",
  "properties": {
    "code": {
      "type": "string",
      "enum": [
        "RATE_LIMITED"
      ]
    },
    "message": {
      "type": "string"
    },
    "retry_after": {
      "type": "number",
      "description": "Seconds to wait before retrying"
    },
    "global": {
      "type": "boolean",
      "description": "Whether this is a global rate limit"
    }
  },
  "required": [
    "code",
    "message",
    "retry_after"
  ]
}

500

Internal Server Error - An unexpected error occurred

json

{
  "type": "object",
  "properties": {
    "code": {
      "$ref": "#/components/schemas/APIErrorCode"
    },
    "message": {
      "type": "string",
      "description": "Human-readable error message"
    },
    "errors": {
      "type": "array",
      "description": "Field-specific validation errors",
      "items": {
        "$ref": "#/components/schemas/ValidationErrorItem"
      }
    }
  },
  "required": [
    "code",
    "message"
  ]
}