static/admin/config/collections/forms.js

@@ -38,6 +38,9 @@ const FormsCollection = {
           label: "Datei",
           widget: "file",
           required: true,
+          media_library: {
+            folder_support: true,
+          }
         },
       ],
     },

static/admin/config/props.js

@@ -63,6 +63,9 @@ const MarkdownProps = {
       "shortcode",
     ],
   },
+  media_library: {
+    folder_support: true,
+  }
 };
 
 const DateFormat = {