I recently lost a Freeform board due to syncing problems with iCloud, and tried to recover it by restoring Users/<my account>/Library/Containers/Freeform from Time Machine, but Freeform could not read the restored data.
Any suggestions on what to do?
I mention this matter here because Freeform is potentially a very useful developer tool -- for interface design -- but it is certainly unacceptable if there is no way to back up its data in recoverable form.
I did submit a report to Apple with Feedback Assistant.