how can set multiple submit buttons for uploading - php

Question

i want 14 records to be uploaded. Before uploading i want to select corresponding check button. At a time only one record can be uploaded. So all 14 records are arranged in a table with two buttons, one for choose file and other for submit. But problem is that only very first document is uploaded, others don't get uploaded. later i knew that i must use more than one form for all submission. how can it possible?
<div class="portal-body" style="min-height: 268px;">
<table class="table striped hover bordered" id="sample_editable_4">
<thead>
<tr>
<th id="eval_style">Sl No.</th>
<th id="eval_style">Document Name</th>
<th id="eval_style">select</th>
<th id="eval_style">Choose</th>
<th id="eval_style">Submit</th>
</tr>
</thead>
<tbody>
<?php $i=1;
foreach($evidence_details->result() as $row_evidence) { ?>
<tr>
<td><?php echo $i; ?></td>
<td><?php echo $row_evidence->evidence_name; ?> </td>
<td>
<input type="checkbox" name="evidences" id="<?php echo $row_evidence->evidence_id; ?>" value="<?php echo $row_evidence->evidence_id; ?>" <?php if(in_array($row_evidence->evidence_id,$evidence)) { ?>checked="checked"<?php } ?> />
</td>
<td><input type="file" name="multiUpload" id="multiUpload" multiple /></td>
<td><button type="submit" class="btn blue" name="submitHandler" id="submitHandler" style="margin-top: 15px;margin-left: 54px;">Submit</button></td>
</tr>
<?php $i++; } ?>
</tbody>
</table>
</div>
<script type="text/javascript">
var config = {
support : "image/jpg,image/png,image/bmp,image/jpeg,image/gif,application/vnd.ms-excel,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,text/csv,application/pdf",
form: "demoFiler", // Form ID
dragArea: "dragAndDropFiles",
uploadUrl: "<?php echo base_url(); ?>home/multiple_upload"
}
$(document).ready(function()
{
initMultiUploader(config);
});
</script>
controller
function multiple_upload()
{
$application_id=$this->session->userdata('application_id');
if(!is_dir('./application/assets/uploads/'.$application_id))
{
mkdir('./application/assets/uploads/'.$application_id, 0777, TRUE);
}
if($_SERVER['REQUEST_METHOD'] == "POST"){
if(move_uploaded_file($_FILES['file']['tmp_name'], "./application/assets/uploads/".$application_id."/".$_FILES['file']['name'])){
echo($_POST['index']);
}
exit;
}
}
**multiupload.js**
function initMultiUploader(){
new multiUploader(config);
}