curl --request POST \
  --url https://api.example.com/api/core/files \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form 'file=<string>'

{
  "stem": "<string>",
  "extension": "<string>",
  "hash": "<string>",
  "view_uri": "<string>",
  "download_uri": "<string>",
  "num_pages": 123,
  "num_chunks": 123,
  "num_tokens": 123,
  "document_type": "document"
}