I use the below method to upload files to server
<form action=\"file-upload.html\" method=\"post\" enctype=\"multipart/form-data\">
Send these files:<br>
<input name=\"userfile[]\" type=\"file\"><br>
<input name=\"userfile[]\" type=\"file\"><br>
<input type=\"submit\" value=\"Send files\">
</form>
However, is that possible I can assign index number inside blacket like userfile[0], userfile[1].