In the app Preferences of Protect Files, you can choose between two options for the creation of spaces:
Self-mounting encrypted space
Encrypted disk image
The Self-mounting Encrypted Space is packed up in a convenient and easy interface to unlock and lock the space. Additionally the Self-mounting Encrypted Space, automatically optimizes the enclosed disk image to reclaim unused space every time the space is used. What’s more the Self-mounting encrypted space app guides the user when using the encrypted space with clear step by step information.