I've solved, the plugin creates a form in a iframe, where it clones the input file getting it by the id passed in the constructor.
After line 159 I've addedd: $('input').clone().appendTo($(form)); this is the piece of code to modify: 154 { 155 // var io = $('#' + frameId); 156 var form = $('#' + formId); 157 $(form).attr('action', s.url); 158 $(form).attr('method', 'POST'); 159 $(form).attr('target', frameId); NEWLINE $('input').clone().appendTo($(form)); 160 if(form.encoding) 161 { 162 form.encoding = 'multipart/form-data'; 163 } 164 else 165 { 166 form.enctype = 'multipart/form-data'; 167 } 168 $(form).submit(); 169 } catch(e) maybe can be useful for someone :-) Bye