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Showing content from https://developers.notion.com/docs/importing-external-files below:

Importing external files

To initiate the process of transferring a temporarily-hosted public file into your Notion workspace, use the Create a file upload with a mode of "external_url", a filename, and the external_url itself:

curl --request POST \
  --url 'https://api.notion.com/v1/file_uploads' \
  -H 'Authorization: Bearer ntn_****' \
  -H 'Content-Type: application/json' \
  -H  'Notion-Version: <<latestNotionVersion>>' \
  --data '{
    "mode": "external_url",
    "external_url": "https://example.com/image.png",
    "filename": "image.png"
  }'

At this step, Notion will return a validation_error (HTTP 400) if any of the following are true:

• The URL is not SSL-enabled, or not publicly accessible.
• The URL doesn’t expose the Content-Type header for Notion to verify as part of a quick HEAD HTTPS request.
• The Content-Length header (size) of the file at the external URL exceeds your workspace’s per-file size limit.
• You don’t provide a valid filename and a supported MIME content type or extension.

After Step 1, Notion begins processing the file import asynchronously. To wait for the upload to finish, your integration can do one of the following:

1. Polling. Set up your integration to wait a sequence of intervals (e.g. 5, 15, 30, and 45 seconds, or an exponential backoff sequence) after creating the File Upload and poll the Retrieve a file upload until the status changes from pending to uploaded (or failed).
2. Listen to webhooks. Notion will send one of the following types of integration webhook events:
   1. file_upload.complete
      1. The import is complete, and your integration can proceed to using the FileUpload ID in Step 3.
   2. file_upload.upload_failed
      1. The import failed. This is typically due to:
         1. File size is too large for your workspace (per-file limit exceeded).
         2. The external service temporarily hosting the file you’re importing is experiencing an outage, timing out, or requires authentication or additional headers at the time Notion’s systems retrieve your file.
         3. The file storage service Notion uses is experiencing an outage (rare).
      2. Check the data[file_import_result] object for error codes and messages to help troubleshoot.
      3. Try again later or with a smaller file. You won’t be able to attach the failed File Upload to any blocks.
   3. For both success and failure, the entity of the webhook payload will contain a type of "file_upload" and an id containing the ID of the FileUpload from Step 1.

Screenshot of webhook settings in the Notion creator profile integration settings page.

The outcome of the file import is recorded on the File Upload object. If the import fails, the status changes to failed. If it succeeds, the status changes to uploaded.

For example, in response to a file_upload.upload_failed webhook, your system can read the data.file_import_result.error from the webhook response, or use the Retrieve a file upload API and check the file_import_result.error to debug the import failure:

// GET /v1/file_uploads/:file_upload_id
// --- RETURNS -->
{
  "object": "file_upload",
  // ...
  "status": "failed",
  "file_import_result": {
    "type": "error",
    "error": {
      "type": "validation_error",
      "code": "file_upload_invalid_size",
      "message": "The file size is not within the allowed limit of 5 MiB. Please try again with a new file upload.",
      "parameter": null,
      "status_code": null
    },
  }
}

The file_import_result object contains details on the success or error. In this example, the problem is a file size validation issue that wasn’t caught during Step 1—potentially because the external host did not provide a Content-Length header for Notion to validate with a HEAD request. The same file size limits of 5 MiB for a free workspace and 5 GiB for a paid workspace apply to external URL mode.

A file upload with a status of failed cannot be reused, and a new one must be created.

Using its ID, attach the File Upload (for example, to a block, page, or database) within one hour of creating it to avoid expiry.

Updated about 2 months ago

• Table of Contents
• • Step 1: Start a file upload
  • Step 2: Wait for the import to complete
  • Step 3: Attach the file upload

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