Yii2: Combining Kartik's FileInput & Kartik's DetailView - php

Question

I'm trying single-file uploads using Kartik's FileInput.
Things go fine when doing this through standard create form as the following returns non-null:
$filedata = UploadedFile::getInstance($model, 'filedata');
However it always returns null when going into Kartik's DetailView in edit mode and trying to update the file.
In view.php I have:
[
'attribute' => 'filedata',
'visible' => Yii::$app->user->can('doIt'),
'type' => DetailView::INPUT_FILEINPUT,
'rowOptions' => ['class' => 'kv-view-hidden'],
'widgetOptions' => ['options' => ['accept' => 'application/pdf'],
'pluginOptions' => [
'showUpload' => false,
'allowedFileExtensions' => ['pdf'],
'initialCaption' => $model->filename,
],
'pluginEvents' => [
'filecleared' => <whatever>,
'fileloaded' => <whatever>,
],
],
],
while in _form.php (which does work):
<?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]); ?>
<?= $form->field($model, 'filedata')->widget(FileInput::classname(), [
'options' => ['accept' => 'application/pdf'],
'pluginOptions' => [
'showUpload' => false,
'allowedFileExtensions' => ['pdf'],
'initialCaption' => $model->getOldAttribute('filename'),
],
'pluginEvents' => [
'filecleared' => <whatever>,
'fileloaded' => <whatever>,
],
])
?>
Any ideas? (BTW, don't know whether 'multipart/form-data' is needed somehow in view.php as it is in _form.php, so anyone confirming this and giving some details should be welcome).

Answer 1

Of course, multipart/form-data is needed both in _form.php and view.php as well, as follows:
'formOptions' => ['options' => ['enctype' => 'multipart/form-data']],
'attributes' => [
...
[
'attribute' => 'filedata',
'visible' => Yii::$app->user->can('doIt'),
'type' => DetailView::INPUT_FILEINPUT,
'rowOptions' => ['class' => 'kv-view-hidden'],
'widgetOptions' => ['options' => ['accept' => 'application/pdf'],
'pluginOptions' => [
'showUpload' => false,
'allowedFileExtensions' => ['pdf'],
'initialCaption' => $model->filename,
],
'pluginEvents' => [
'filecleared' => <whatever>,
'fileloaded' => <whatever>,
],
],
],
....
]