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I am trying to use ctools modal form to edit node form. This form is containing a file field. The Form is rendering properly. When I try to upload a file on clicking upload button, file field has been deleted from the page. I tried to debug via firebug to see the response, it was correct as we get without modal form.

I added the following code in modal callback.

ctools_include('node.pages', 'node', '');
ctools_include('modal');
ctools_include('ajax');

$form_state['build_info']['args'] = isset($form_state['build_info']['args']) ? $form_state['build_info']['args'] : array($node);
form_load_include($form_state, 'inc', 'node', 'node.pages');

I took the reference from Ajax upload in Ctools Modal Window but it still having problem.

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Make sure you're implementing the right Drupal API syntax which requires $form_state to be the reference to the original array, so it can be properly modified through certain hooks.

For example if you're using form_load_include() in hook_form_alter(), make sure you're following the right API syntax which is:

hook_form_alter(&$form, &$form_state, $form_id)

(note the &) otherwise form_load_include() can't perform alterations of your current state of the form ($form_state).

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