Ohhh, entonces estaba usando dos formas diferentes y con una la podía hacer desde el comienzo, o sea usando Zend_Form. Como recomendación ¿que se sugiere usar Zend_File_Transfer o Zend_Form para subir archivos?
Edito:
Según el manual dice
Cita: It utilizes Zend_File_Transfer internally to provide this functionality, and the FormFile view helper as also the File decorator to display the form element.
By default, it uses the Http transfer adapter, which introspects the $_FILES array and allows you to attach validators and filters. Validators and filters attached to the form element are in turn attached to the transfer adapter.
Por eso es bueno usar solo Zend_Form
