curl --request POST \
  --url https://api.example.com/api/widget/files/upload \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form 'task_type=<string>' \
  --form 'file=<string>' \
  --form 'files=<string>' \
  --form message= \
  --form 'task_id=<string>' \
  --form 'folder=<string>' \
  --form file.0='@example-file' \
  --form files.0.items='@example-file'

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}