Sorry for my keep asking but I really don&#39;t know what the value of argument &quot;fieldName&quot; in &quot;addAttachments(fieldName)&quot; is.<br>Is it related to the value of file input ?? <br>&lt;form action=&quot;&quot; &nbsp;enctype=&quot;multipart/form-data&quot; method=&quot;post&quot;&gt;<br>
&lt;input type=&quot;file&quot; name=&quot;file&quot;/&gt;