Can I copy or move files/folders from the Koofr web/mobile applications to Koofr Vault?

No. Koofr Vault is a client-side encrypted service. It is not possible to copy or move your unencrypted files or folders from the Koofr web/mobile applications to Koofr Vault, as they will not get encrypted. The only way to add files or folders into vault is by uploading them throug the Koofr Vault web application or mobile applications for iOS/Android or via rclone.