{"step":"example step", "data":"example data", "result":"example result"}

{"attachments":[ { "data":"gsddfgdsfg...(base64) ", "filename":"example1.txt", "contentType":"plain/text" } ] }

{
   "step":"example step",
   "data":"example data",
   "result":"example result",
   "attachments":[
      {
         "data":"gsddfgdsfg...(base64) ",
         "filename":"example1.txt",
         "contentType":"plain/text"
      },
      {
         "data":"gsddfgdsfg...(base64) ",
         "filename":"example2.txt",
         "contentType":"plain/text"
      }
   ]
}