AttachedObject::runPreviewGenerationAction

public function runPreviewGenerationAction(DiskAttachedObject $attachedObject)
{
	$file = $attachedObject->getFile();
	if (!$file)
	{
		$this->addError(new Error('Could not find file'));

		return;
	}

	return [
		'previewGeneration' => $file->getView()->transformOnOpen($file),
	];
}