To actually encrypt the file you have to select it then choose the lock icon that is labeled Secure in the menu bar. this will move it to the vault folder and encrypt it. Below is a knowledge base article that should help
https://kb.sandisk.com/app/answers/detail/a_id/18917/
On a computer you can open the vault folder however if the files have properly been secured all you can see is the encrypted database files. You will need to download the secureaccess for mac software and run that from the iXpand drive. It cannot be ran from a computer so the app needs to be copied to and ran from the ixpand itself. to view encrypted files on a computer you would need to run the secure access software and view them in the software itself.
