Deleting files does not free up disk space

So I have had the same issue as this thread (and several other threads on here).  ReadyNas 4 bay with 3 4TB drives with OS6.2. Windows10 computer.  I deleted some files and moved others around between folders.  No space got freed from deleting files, and moving files resulted in losing free space (I'm guessing it didn't delete it once it moved it but did create a second copy).

From reading all these threads I have learned about Snapshots and deleted all of them.  Still no free space created.  I'm hoping there is just some lapse of time until it removes the files that the snapshots were holding onto.  Anyone know if thats true?  And if so, how long that is?  After deleting all snapshots, I set the snapshot settings to weekly for each.  That was a few days ago and no new snapshots have been created yet, so I was wondering if its the creation of a new snapshot that prompts deleting of files held on to by deleted snapshots.  Could that be true?  I reset the snapshot timing to daily so we'll see once a new snapshot is created today if space is freed.

Is there anything else that I am missing?  I saw people talking about a deleted/.purge directory but I don't see it or anyway to show possible hidden folders.