Upload multiple files

curl --request POST \
  --url https://api.gumloop.com/api/v1/upload_files \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "files": [
    {
      "file_name": "<string>",
      "file_content": "aSDinaTvuI8gbWludGxpZnk="
    }
  ],
  "user_id": "<string>",
  "project_id": "<string>"
}'

{
  "success": true,
  "uploaded_files": [
    "<string>"
  ]
}