Attach document or file button is not working in my HTML web app -


attach document or file button not working in html web app -i able records other outputs in sheet except attachment.

below sample code, users should able upload attachment while submitting form , backend attachment should stored in google drive users name

sample sheet, code , html webapp 

function doget(e) {    return htmlservice.createhtmloutputfromfile('index').settitle("testing");  }      function uploadfiletogoogledrive(data, file, name, email) {        try {            var dropbox = "supplier management team (file responses)";      var folder, folders = driveapp.getfoldersbyname(dropbox);            if (folders.hasnext()) {        folder = folders.next();      } else {        folder = driveapp.createfolder(dropbox);      }                  var contenttype = data.substring(5,data.indexof(';')),          bytes = utilities.base64decode(data.substr(data.indexof('base64,')+7)),          blob = utilities.newblob(bytes, contenttype, file),          file = folder.createfolder([name, email].join(" ")).createfile(blob);            return "ok";          } catch (f) {      return f.tostring();    }      }


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