diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index eed654f14..6932d79a2 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -87,7 +87,7 @@ class Attachment < ApplicationRecord
   # stored under storage_path, which is expected to have appropriately
   # restrictive permissions.
   def self.markdownized_previews_storage_path
-    File.join(storage_path, 'markdownized_previews')
+    File.join(storage_path, 'derived_cache', 'markdownized_previews')
   end
 
   before_create :files_to_final_location
diff --git a/files/delete.me b/files/delete.me
index 69e3582f0..f998fcfbd 100644
--- a/files/delete.me
+++ b/files/delete.me
@@ -1,10 +1,10 @@
 default directory for uploaded files
 
-## The `markdownized_previews` subdirectory
+## The `derived_cache/markdownized_previews` subdirectory
 
-Redmine may create a `markdownized_previews` subdirectory in this
-directory to store cached Markdown previews generated from supported
-Microsoft Office and LibreOffice attachments.
+Redmine may create a `derived_cache/markdownized_previews`
+subdirectory in this directory to store cached Markdown previews
+generated from supported Microsoft Office and LibreOffice attachments.
 
 You can safely delete these cached files. They will be automatically
 regenerated when needed.