processmaker-files/workflow/engine/xmlform/setup/uplogo.xml

<?xml version="1.0" encoding="UTF-8"?>
<dynaForm name="languages_ImportForm" type="xmlform" width="450" height="" labelWidth="200">
  <TITLE1 type="title">
    <en><![CDATA[Upload your logo]]></en>
  </TITLE1>
  <MAX_FILE_SIZE type="edit" mode="view">
    <en><![CDATA[Maximum upload file size in bytes]]></en>
  </MAX_FILE_SIZE>
  <LOGO_FILENAME type="file">
    <en><![CDATA[File]]></en>
  </LOGO_FILENAME>
  <!--<CONTINUE type="checkbox">
  <en>Continuing where he stayed last update for the patch (if the last update was not completed satisfactorily)</en>
</CONTINUE>-->
  <LOGO_SAVE type="button" onclick="verifyFile(this.form);">
    <en><![CDATA[Upload]]></en>
  </LOGO_SAVE>
  <JS type="javascript"><![CDATA[
var verifyFile = function(oForm) {

  if (document.getElementById('form[LOGO_FILENAME]').value != '') {
    oForm.submit();
  }
  else {
    alert('@G::LoadTranslation(ID_PLEASE_SELECT_LOGO)');
  }
};
]]></JS>
</dynaForm>