curl --request POST \
  --url http://localhost:8080/anthropic/v1/files \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file' \
  --form 'filename=<string>' \
  --form 'purpose=<string>'

{
  "id": "<string>",
  "type": "file",
  "filename": "<string>",
  "mime_type": "<string>",
  "size_bytes": 123,
  "created_at": "2023-11-07T05:31:56Z",
  "downloadable": true
}