How to recover a saved file


2 days ago I recorded a song in Audacity and saved it. Yesterday when I was adding vocals, it got really slow all of the sudden because of low disk space so I saved it and moved the whole file to my usb stick. It remained working slow and stopped working every time I did something so I had to save, close and re-open every time I wanted to do something. I saved it for the last time and moved it back to my PC.

Now I can’t open the file anymore, please help! It asks for recovery, I click on it but then it say’s 'couldn’t find the project data folder’.
The file is NOT deleted. It is also saved so I don’t know why I can’t open it anymore.


I presume this question is related to this one:
If that’s correct, I’ll close this topic.