Please use the SAME CamScanner account on your devices to see your docs.
To find your CamScanner account, please open the CS app on your phone--bottom Me--Account.
After that, you can sign into www.camscanner.com with this account to check out your docs.
How to log out of the website: open www.camscanner.com on PC/Mac--->tap the account name on top right--->log out.