Upstream sync

app/assets/javascripts/directory_files_input.js

@@ -0,0 +1,9 @@
+$(document).on("turbolinks:load", function() {
+    $("#upload_directory_files").on('click', function(e){
+        const newFilesCount = $('input[name = "directory[files][]"][type = "hidden"]').length;
+
+        if (newFilesCount === 0){
+            e.preventDefault();
+        }
+    });
+});