If you experiencing issues with adding Google Drive files to Kiddom, try removing and re-adding access.
To remove Kiddom access:
- Go to https://myaccount.google.com/.
- On the left navigation panel, select Security.
- On the Third-party apps with account access panel, select Manage third-party access.
- Select Remove Access
Once you remove access, you can then reauthorize Kiddom access when you create your first assignment.