curl --request POST \
  --url https://api.raul.ugps.io/api/v1/activity/{activityId}/files \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file'

{
  "file_id": "<string>",
  "activity_id": "<string>",
  "file_name": "<string>",
  "mime_type": "<string>",
  "file_size": 123,
  "uploaded_at": "2023-11-07T05:31:56Z",
  "file_url": {}
}