{ 
  "table":"all_controls",
  "layout":"form",
  "onecolumn":true,
  "caption": "File Upload",
  "fields": [
    {"name":"x_primary", "type":"int", "key":1},
    {"name":"x_file","type":"file","caption":"x_file", "controlparams": { "data_folder": "tutorials_all_controls" }}
  ]
}