Hi there,
Sorry to hear about the file saving issue, could you please go to the "System Preferences" of your Mac, then "Security and Privacy" and select the "Privacy tab". Once there, please select "Accessibility" from the list on the left and add Photoshop to the list by unlocking the window using the lock icon on the bottom left. Also, grant permissions to Photoshop under "Full disk access". Once done, restart the computer and let us know if that helps.
Regards,
Sahil