B2B-1876: New directories in pub/media do not get synced back to local filesystem from S3 Remote Storage

- upgrade message

Author: joanhe

setup/src/Magento/Setup/Console/Command/UpgradeCommand.php

@@ -163,6 +163,13 @@ protected function execute(InputInterface $input, OutputInterface $output)
                     '<info>Please re-run Magento compile command. Use the command "setup:di:compile"</info>'
                 );
             }
+            $output->writeln(
+                "<info>Media files stored outside of 'Media Gallery Allowed' folders"
+                . " will not be available to the media gallery.</info>"
+            );
+            $output->writeln(
+                '<info>Please refer to Developer Guide for more details.</info>'
+            );
         } catch (\Exception $e) {
             $output->writeln('<error>' . $e->getMessage() . '</error>');
             return Cli::RETURN_FAILURE;