I think I also have a similar problem happening to me as well. Normally I save my work using the “Save to Roblox” option.
But from yesterday onward, I cannot either save nor publish my work returning the message “PLACENAME save failed”.
It seems that for @LuaBearyGood checking the permissions fixed the issue:
Roblox Studio has to have access to the proper files and folders in System Preferences / Security & Privacy / Files and Folders and Full Disk Access.
The Folders should be Downloads Folder, Documents Folder, Desktop Folder.
Alternatively Roblox Studio should be under the Full Disk Access.
The Drafts between Studio Sessions are saved under /Users/<user name>/Documents/Roblox/Sandbox/<place id>/<user id> – and you can check using the Last Modified date if the latest drafts show up there.
We’ll file a ticket for better permissions check for draft.
On the other hand if this is not fixing it for somebody, please let us know!