We have seen some issues with Apple's macOS Catalina and libraries never showing up or disappearing after an update. Apple decided to change all their permission protocols which have messed up a few things.
On your mac, go to ...
- System Preferences / Security & Privacy
- Click on the Privacy tab at the top
- On the left, scroll down and choose "Files and Folders"
- Then on the right scroll down and find Sidekick.
- Make sure the Documents folder under Sidekick is checked (see screenshot)