Multiple file Upload through related model (CakePHP bug?)

Hello!

I'm having problems saving multiple files through related model.

I have the following structure:
Document hasMany Item
Item belongsTo Document
Item belongsTo File

File is a generic model I created to ease attaching a file to a model.

My Document form is like following:
...
$k=0;
echo $form->input('Item.'.$k.'.title');
echo $form->input('Item.'.$k.'.File.filename',
array('type'=>'file'));

After submiting the form, I immediatelly caught debug($this->data),
that outputs:
...
[Item] => Array
(
[0] => Array
(
[title] =>
[File] => Array
(
[name] => Array
(
[filename] =>
)
[type] => Array
(
[filename] =>
)
[tmp_name] => Array
(
[filename] =>
)
[error] => Array
(
[filename] => 4
)
[size] => Array
(
[filename] => 0
)
)
)
)
every File field receives a strange array.

for the following:
Document HASONE Item
Item belongsTo Document
Item belongsTo File
and:
echo $form->input('Item.title');
echo $form->input('Item.File.filename', array('type'=>'file'));
everything goes like expected.
...
[Item] => Array
(
[title] =>
[File] => Array
(
[name] =>
[type] =>
[tmp_name] =>
[error] => 4
[size] => 0
)
)

Suggestions?
Thank you!

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