for ($i = 0; $i < 4; $i++) {
 <form id="TypeValidation" method="" enctype="multipart/form-data">
 <input type="hidden" id="pii_categoryid" name="pii_categoryid" value="<?php echo $i;?>" />
    <div>
        <span class="btn btn-rose btn-round btn-file">
        <span class="fileinput-new">Select File</span>
        <span class="fileinput-exists">Change</span>
          <input type="file" name="<?php echo $fileName;?>_attachment" id="<?php echo $fileName;?>_attachment" accept=".xlsx, .xls, .csv" />
        </span>
          <a href="#" class="btn btn-danger btn-round fileinput-exists" data-dismiss="fileinput"><i class="fa fa-times"></i> Remove</a>
          <button type="submit" name="add_file" id="add_file" value="<?php echo $fileName;?>_file" class="btn btn-success btn-round fileinput-exists">Upload</button>
    </div>
 </form>
}

$("#TypeValidation").on('submit',(function(e)
{
var pii_categoryid = $(this).find('input[name="pii_categoryid"]').val();
var fileUploadID = $(this).find('button[name="add_file"]').val();
        e.preventDefault();
   $.ajax({
        url: "fn_dsr_wizard_submit.php?submitid="+fileUploadID,
        type: "POST",
        data:  new FormData(this),
    contentType: false,
        cache: false,
        processData:false,
        dataType: "html",
        success: function (result) {
        alert(result);
        //prompt("Copy to clipboard: Ctrl+C, Enter", result);
        location.reload();
        if(result=='1'){
            location.replace("ds_dashboard.php");
        }else {
            location.replace("ds_dashboard.php");
        }
        }
    });
    }
    ));