Multi File Upload Problem

First, May I apologize for my English as I'm not using it as my first language.

Here I have a problem with a multi file upload.
In my form, I have 4 file upload fields.
It's only work one first field when I uploaded an image.
The rest it didn't work. Is there anything need to be setting?
Please give me some guidance. I am new to this area.

Here are the field names appear in my form:-

<div class="form_item">
<div class="form_element cf_fileupload">
<label class="cf_label" style="width: 150px;"></label>
<input class="cf_fileinput cf_inputbox" title="" size="20" id="file_0" name="file_0" type="file" />

</div>
<div class="cfclear"> </div>
</div>

<div class="form_item">
<div class="form_element cf_fileupload">
<label class="cf_label" style="width: 150px;"></label>
<input class="cf_fileinput cf_inputbox" title="" size="20" id="file_1" name="file_1" type="file" />

</div>
<div class="cfclear"> </div>
</div>

<div class="form_item">
<div class="form_element cf_fileupload">
<label class="cf_label" style="width: 150px;"></label>
<input class="cf_fileinput cf_inputbox" title="" size="20" id="file_2" name="file_2" type="file" />

</div>
<div class="cfclear"> </div>
</div>

<div class="form_item">
<div class="form_element cf_fileupload">
<label class="cf_label" style="width: 150px;"></label>
<input class="cf_fileinput cf_inputbox" title="" size="20" id="file_3" name="file_3" type="file" />

</div>
<div class="cfclear"> </div>
</div>

And here is my the Files Upload Settings :-

file_0:jpg|gif|png|jpeg|zip|rar{30000-10}

Thank you in advance for your support 😀

Hi venusbluewings,

You only have File Upload Settings for file_0, the first one.

Bob