I created an encrypted file "FILE". Put some files in it. Then I created a hidden volume inside of there. Then I put some files in that place.
I then put "FILE" in a USB stick. Just drag and copy, nothing fancy.
Then I copied "FILE" to another computer. I unencrypted the NON-hidden volume, extracted the files. Then I put "FILE" in the recycle bin. I then used CCleaner to try to wipe it.
I noticed after a computer restart that "FILE" was no longer but that all the stuff in the hidden volume had been exposed. I restored them to my desktop to see if they had the right contents and whether everything was in there and lo and behold they