I may be oversimplifying this because I had your issues as well. What I learned to do was create a folder where I want it to go (whether on the device, or a computer desktop) and open it. Make the window small enough so that it can be side by side with the vault page. Then, to transfer the files, just highlight the ones you want to move – and I also discovered if I was trying to move more than 4 gb worth at a time, it caused the program to crash. So be aware of your bits and bytes and how they might add up to 4 gb. As long as you have highlighted less than 4gb of data, then “DRAG” it to the open window of the place you want to put the files.
If you click on them accidentally instead of dragging, it often causes a weird exception that forces the vault program to have to be turned off so you have to re-log in. It was cumbersome *without* that quirk.
After dragging and dropping, the vault page will ask you if you want to delete the original file from the vault. There is a tick box that you can say “don’t ask me again” or something. But the files that you moved and thus unencrypted are the same as they were before you ever put it in the vault and can be moved anywhere you want to without hindrance.