curl --request POST \
  --url https://app.all-hands.dev/api/conversations/{conversation_id}/upload-files \
  --header 'Content-Type: multipart/form-data' \
  --header 'X-Session-API-Key: <api-key>' \
  --form 'files=<string>' \
  --form files.items='@example-file'

{
  "file_urls": [
    "<string>"
  ],
  "skipped_files": [
    "<string>"
  ]
}