Google tts ultimate node - questions, kinda

Sorry folks, but I just want to ask/check with people about this node.

When I'm logged into that machine and am looking.

~/.node-red/sonospollyttsstorage $ ls
hailingpermanentfiles  ttsfiles  ttspermanentfiles  ttsultimategooglecredentials

ttsfiles is/are the temporary files used/needed to get it to talk.
ttspermanentfiles...... I'm guessing are permanent files.

But how do I get to use them?

Do I need credentials?

Someone?

What you wanna do?

Do you want text to spoken in computer speakers? Or in your SONOS speakers?

On the computer's speakers.

Wasn't this already solved once? Or a new problem?

Well, this is more a Follow up question.

I got it working and it works as I expect.

The whole thing is running on a ... 32 GB SD card.

There are quiet a few messages played and once - a while back - I noticed the SD card was nearly full when usually it isn't.

A quick dig around and I discovered that EVERY message's file was kept in the ttsfiles directory.
Not a big deal, I added some extra code so it deleted the file after a short pause allowing it to be played.

Yes: I caused this situation by deleting the files.

But as they ALL aren't needed.

In the course of doing this I did see that if there was an existing file for the same message, it cached getting the file from google. Which is kind of nice and smart - and economical.

So after a bit of messing around I kept the files who get used often - as there are some of them - and thought nothing more of it.

Alas until recently when I was back in that directory and noticed NO FILES AT ALL.
Eeeek!

Did some more testing and - alas - the code I wrote did work and didn't delete the files, but any subsequent use of the file/s deleted them on their second use.
(That is stupid - to me)
But then I thought more about it and saw/realised there is a ttspermanentfiles directory also.
It has a couple of examples but of no use to me.

So: looking at the docs of the node, nada. (Nothing)

I'm wanting to know if there is a way to that if I put the files (or more so: move them) from that original directory to the permanent one...... would that work?

Ok, I haven't tested it. I thought I'd ask.
Can't hurt - can it?

That is a great explanation of your target. Now I assume people around will better understand what you are looking to achieve. Therefore, I thought I'd ask you, for a better description