Add warning to install CiviCRM first, then Drush

docs/drupal/index.md

@@ -69,6 +69,14 @@ composer require civicrm/civicrm-{core,packages,drupal-8}:'~5.42'
 
 You should adjust the example path (`/var/www/d9.example.org`) and the example version (`~5.42`) as needed.
 
+!!! warning "Install CiviCRM before Drush" You should install CiviCRM packages before installing Drush to avoid dependency issues with `symfony/finder` or `symfony/filesystem`. If you've already got Drush installed and want to install CiviCRM remove Drush first.
+
+    ```bash
+    composer remove drush/drush
+    composer require civicrm/civicrm-{core,packages,drupal-8}
+    composer require drush/drush
+    ```
+
 If you'd like more details to understand these commands or common errors, then please drill-down below.
 
 ??? info "More detail: Enable patching"