Folder Encryptor add-on for MiXplorer File Manager.
MiX Encrypt (MiXplorer add-on) — description
EncFS add-on addon for MiXplorer file manager. This app will not appear in your launcher. You can uninstall it from Android or MiXplorer settings. Requires MiXplorer v6.69.1+.
MiXplorer Silver can be downloaded from here: https://play.google.com/store/apps/details?id=com.mixplorer.silver