What happens with Quicktime files that do not get saved to ~/Library/Containers/com.apple.QuickTimePlayerX/Data/Library/Autosave Information/ ? Do they get lost?

Hello:

I attempted to record sound using quicktime knowing the process may end once the laptop run out of memory (126 gb in an ssd), and I was ok with that. After 4 hours, I went to turn the recorder off. Knowing Quick time has difficulties saving recordings of over an hour, and also knowing I can retrieve recordings that have not been fully processed from ~/Library/Containers/com.apple.QuickTimePlayerX/Data/Library/Autosave Information/ , I did not worry too much. I also knew I needed to open the package contents to obtain the sound file and play it in quicktime again.

However, to my big disappointment, when I went to the autosave information folder, the recording was not there at all! It was empty! So is quicktime an all-or-nothing recording device? does it record up to the point it runs out of memory and then, it stops recording, or if it cannot continue recording, it simply shuts off and does not save even a portion of that recording? Where can I find whatever was recorded up to the point it shut off?

Thanks!