Handle user clicking upload button early

app/controllers/admin/terms_of_service_files_controller.rb

@@ -15,6 +15,9 @@ module Admin
     def create
       TermsOfServiceFile.create!(file_params)
       redirect_to main_app.admin_terms_of_service_files_path
+    rescue ActionController::ParameterMissing
+      flash[:error] = t(".select_file")
+      redirect_to main_app.admin_terms_of_service_files_path
     end
 
     def destroy

config/locales/en.yml

@@ -449,6 +449,8 @@ en:
       embedded_shopfronts_whitelist: "External Domains Whitelist"
 
     terms_of_service_files:
+      create:
+        select_file: "Please select a file first."
       show:
         title: "Terms of Service files"
         no_files: "No terms of services have been uploaded yet."