This only happens in Numbers. I can save or edit Pages documents without any problems. I'm the only user on my computer (MacStudio Ventura 13.4.1)
Mac Studio (2023)
Where are you trying to save the Numbers document? On iCloud Drive? In a local Mac folder? On an external drive?
Possibly you have Pages set to save in a different location?
SG
I tried on my desktop and then a local folder. Saved a Pages file to my desktop successfully, so I repeated that process for Numbers but get a permissions error.
In fact, I tried on my laptop and didn't have any issue saving the file. So it's definitely my new MacStudio.
The document “Untitled.numbers” could not be saved as “Untitled.numbers”. You don’t have permission.
