Do not automatically encrypt files moved to encrypted folders
Computer Configuration\Administrative Templates\System
Prevents Windows Explorer from encrypting files that are moved to an encrypted folder.
If you disable this policy or do not configure it, Windows Explorer automatically encrypts files that are moved to an encrypted folder.
This policy applies only to files moved within a volume. When files are moved to other volumes, or if you create a new file in an encrypted folder, Windows Explorer encrypts those files automatically.