Update encore/copy-files.rst: add note about using versioning with custom target path

Author: mhujer

frontend/encore/copy-files.rst

@@ -52,6 +52,11 @@ This will copy all files from ``assets/images`` into ``web/build`` (the output
 path). If you have :doc:`versioning enabled <versioning>`, the copied files will
 include a hash based on their content.
 
+.. note::
+
+    If order to use versioning with with custom target path (``to``), you need to
+    update to path to include the file hash: ``images/[path][name].[hash:8].[ext]``.
+
 To render inside Twig, use the ``asset()`` function:
 
 .. code-block:: html+twig