How to implement a for-loop for an SFTP-Server

  1. I am setting up an SFTP-Server with Nodejs with several functions implemented. (Read, delete, download…)The problem is, that the server only sees the content of the first file in the directory he reads. Meaning while I can see all files lined up with the help of my WinSCP Client, it only opens the content of the first file. When I click on the second file, it shows the content of the first again, although the file is named different and so on. When I try to download the files, same happens; you can download each file, but as soon as you open them there is the content of the very first file in my directory. I know that it has to do with the for-Loop I wasn’t able to implement for a while now. I hope you guys can help with some experience/ expertise. I used dummy user names and Paths for this website.
session.on("readdir", function(files, responder) {
var i = 0;
          responder.on("dir", function() {
            **if (results[i])** {
              console.warn(now + " Returning file: " + results[i]);
              responder.file(results[i]);
              **return i++;**
            } else {
            return responder.end();
            } 
          });
          return responder.on("end", function() {
            return console.warn(now + " Directory has been read");
          });
        });

session.on('stat', function(path, statkind, statresponder) {
      statresponder.is_file();             
      statresponder.permissions = 0o777; 
      statresponder.uid = 1;             
      statresponder.gid = 1;                   
      statresponder.size = 1234;        
   });

session.on("readfile", function(path, writestream) {
      var i = 0;
      **if(results[i])** {
        console.log(now + " Reading file: " **+ results[i]);**
        return fs.createReadStream("KKK_Files/"+results[i]).pipe(writestream); 
     }
      else { 
       console.warn(now + " no file to read");
      }
    }) 

session.on("delete", function(path, writestream) {
session.sftp(function(err, sftp) {
      if (err) throw err;
      var i = 0;
      fs.unlink("KKK_Files/" **+ results[i],** function(err){
         if ( err ) {
             console.log( "Error, problem starting SFTP: %s", err );
                 }
                 else
                 {
                  console.log(now + " all Files have been deleted");
                 }
             });
          });

        session.on("download", function(path, fastGet) {
            var moveTo = "C:/Users/User/Downloads/file.DAT";
            if (err) throw err;
            var i = 0;
                 fs.fastGet("KKK_Files/" + 
                        **results[i],**moveTo,function         
                 (err) {if ( err ) {
                  console.log("Error downloading the file", err);
                }
                else
                {
                console.log(now + "Successfully downloaded");
                }
              });
            });
             files.forEach(files => {
          results.push(files);
        });
      });
    });
 });
  1. What didn’t work:
for**(i=0; i<results.lenth; i++)** {
        console.log(now + " Reading file: " + results[i]);
        return fs.createReadStream("KKK_Files/" + results[i]).pipe(writestream); 
    }if (err) throw err;