Hello GWZjr,iijpij
Welcome to Apple Support Communities! We understand your drives aren't showing in the Finder since updating your Mac. We're happy to assist you with this.
Let's check disk utility to see if the drives show there: View all devices or only volumes in Disk Utility on Mac
If they appear here, it's possible they need to be repaired or reformatted. You will select the connected disk in disk utility prior to performing "first aide": How to repair a Mac disk with Disk Utility
Next, test in a new user account to ensure there's nothing in the primary user account causing this issue:
Set up users, guests and groups on Mac - Apple Support
Best Regards.