I'm trying to create my custom form on a backend module, I need to allow the admin to select some categories, so I wanted to use the magento standard category selector, well I add my field in this way:
$fieldset->addField( 'input_id', 'Magento\Catalog\Block\Adminhtml\Product\Helper\Form\Category', [ 'name' => 'input_name', 'label' => __('My label'), 'title' => __('My title'), 'required' => true ] );
then in the .xml of my custom module (where I call the block with the form) I also added this css in the head
<head> <title> Settings </title> <css src="Magento_Catalog::web/catalog/category-selector.css" /> </head>
In my module now I could find the input, but the css is not loaded (I get error 404 in the console log) and It not work fine.
I already tryed to clean the cache and run the deploy of static content, but I still get the same error.
If is possible I would like to know how to add a short description for each input to made easier to understand what they have to input.