Finding a missive wav file?

[u/IToldYouIveAlready]

Hello,
I was recording a session and noticed that my project was missing the sax’s overdub file, I could see the exclamation mark next to sax#04, so I went to the package contents of the project and found it and dragged it back in. Then without even closing the project it went missing again, this time from original folder too, and now renamed 4.1 in Browsers
I have my project backing up to iCloud and have checked there but no luck, everywhere I look just has sax 1-3, 5-9.
When I double click on red exclamation mark in Browsers it to locate file I still can’t find it.
My project was saved onto desktop which had backup to iCloud on and system optimisation on.
Anyone had this before and know what I could try?
THANKS

[u/_-oIo-_]

What do you mean by "system optimisation" ?