# Upload file

Uploads a document to the eSAW platform. Call once per document to be signed.
Returns a FileId to use in the envelope send request.

Endpoint: POST /Api/v6/file/upload
Version: v1
Security: ApiToken

## Request fields (multipart/form-data):

  - `File` (string)
    The file to upload

## Response 200 fields (application/json):

  - `FileId` (string)
    Example: "aa4e3300-c254-4430-ac16-2f2d96090b3a"